fix comment errors

include/boost/astronomy/coordinate/arithmetic.hpp

@@ -137,7 +137,7 @@ auto cross
 {
     /*!both the coordinates/vector are first converted into
     cartesian coordinate system then cross product of both cartesian
-    vectors is converted into cartesian system type and returned*/
+    vectors is converted into cartesian differential type and returned*/
 
     /*checking types if it is not subclass of   
     base_representaion then compile time erorr is generated*/
@@ -246,7 +246,7 @@ auto cross
 {
     /*!both the coordinates/vector are first converted into
     cartesian coordinate system then cross product of both cartesian
-    vectors is converted into cartesian system type and returned*/
+    vectors is converted into spherical differential system type and returned*/
 
     /*checking types if it is not subclass of   
     base_representaion then compile time erorr is generated*/
@@ -341,7 +341,7 @@ auto cross
 {
     /*!both the coordinates/vector are first converted into
     cartesian coordinate system then cross product of both cartesian
-    vectors is converted into cartesian system type and returned*/
+    vectors is converted into spherical equatorial differential system type and returned*/
 
     /*checking types if it is not subclass of   
     base_representaion then compile time erorr is generated*/
@@ -437,7 +437,7 @@ auto cross
 {
     /*!both the coordinates/vector are first converted into
     cartesian coordinate system then cross product of both cartesian
-    vectors is converted into cartesian system type and returned*/
+    vectors is converted into spherical coslat differential system type and returned*/
 
     /*checking types if it is not subclass of   
     base_representaion then compile time erorr is generated*/
@@ -568,7 +568,7 @@ template<typename Differential2, typename ...Args>
 auto dot(spherical_coslat_differential<Args...> const& differential1, Differential2 const& differential2)
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then dot product of both cartesian
+    cartesian differential system then dot product of both cartesian
     product is converted into requested type and returned*/
 
     /*converting both coordinates/vector into cartesian system*/
@@ -615,7 +615,7 @@ template<typename Differential2, typename ...Args>
 auto dot(spherical_equatorial_differential<Args...> const& differential1, Differential2 const& differential2)
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then dot product of both cartesian
+    cartesian differential system then dot product of both cartesian
     product is converted into requested type and returned*/
 
     /*converting both coordinates/vector into cartesian system*/
@@ -663,7 +663,7 @@ auto dot(cartesian_differential<Args...> const& differential1, Differential2 con
 {
 
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then dot product of both cartesian
+    cartesian differential system then dot product of both cartesian
     product is converted into requested type and returned*/
 
     /*converting both coordinates/vector into cartesian system*/
@@ -709,7 +709,7 @@ template<typename Differential2, typename ...Args>
 auto dot(spherical_differential<Args...> const& differential1, Differential2 const& differential2)
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then dot product of both cartesian
+    cartesian differential system then dot product of both cartesian
     product is converted into requested type and returned*/
 
     /*converting both coordinates/vector into cartesian system*/
@@ -1011,7 +1011,7 @@ auto sum
 )
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then sum of both cartesian
+    cartesian differential system then sum of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef cartesian_differential<Args...> Differential1;
@@ -1055,7 +1055,7 @@ auto sum
 )
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then sum of both cartesian
+    cartesian differential system then sum of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_differential<Args...> Differential1;
@@ -1099,7 +1099,7 @@ auto sum
 )
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then sum of both cartesian
+    cartesian differential system then sum of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_coslat_differential<Args...> Differential1;
@@ -1142,7 +1142,7 @@ auto sum
 )
 {
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then sum of both cartesian
+    cartesian differential system then sum of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_equatorial_differential<Args...> Differential1;
@@ -1236,7 +1236,7 @@ auto mean
 {
 
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then mean of both cartesian
+    cartesian differential system then mean of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef cartesian_differential<Args...> Differential1;
@@ -1282,7 +1282,7 @@ auto mean
 {
 
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then mean of both cartesian
+    cartesian differential system then mean of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_differential<Args...> Differential1;
@@ -1328,7 +1328,7 @@ auto mean
 {
 
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then mean of both cartesian
+    cartesian differential system then mean of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_equatorial_differential<Args...> Differential1;
@@ -1374,7 +1374,7 @@ auto mean
 {
 
     /*!both the coordinates/vector are first converted into
-    cartesian coordinate system then mean of both cartesian
+    cartesian differential system then mean of both cartesian
     vectors is converted into the type of first argument and returned*/
 
     typedef spherical_coslat_differential<Args...> Differential1;