chore: fix some comments

Signed-off-by: renshuncui <[email protected]>

book/src/programmability/collections.md

@@ -26,7 +26,7 @@ as a list of unique IDs or addresses.
 {{#include ../../../packages/samples/sources/programmability/collections.move:vec_set}}
 ```
 
-VecSet will fail on attempt to insert a an item that already exists in the set.
+VecSet will fail on attempt to insert an item that already exists in the set.
 
 ## VecMap
 

reference/src/control-flow/pattern-matching.md

@@ -596,7 +596,7 @@ public struct MyStruct2 {
 fun wild_match(x: MyStruct) {
     match (x) {
         MyStruct(.., 1) => 1,
-        // OK! The `..` pattern can be used at the begining of the constructor pattern
+        // OK! The `..` pattern can be used at the beginning of the constructor pattern
         MyStruct(1, ..) => 2,
         // OK! The `..` pattern can be used at the end of the constructor pattern
         MyStruct(1, .., 1) => 3,

reference/src/functions/macros.md

@@ -53,7 +53,7 @@ substituted at each usage.
 ## Lambdas
 
 Lambdas are a new type of expression that can only be used with `macro`s. These are used to pass
-code from the caller into the body of the `macro`. While the substition is done at compile time,
+code from the caller into the body of the `macro`. While the substitution is done at compile time,
 they are used similarly to [anonymous functions](https://en.wikipedia.org/wiki/Anonymous_function),
 [lambdas](https://en.wikipedia.org/wiki/Lambda_calculus), or
 [closures](<https://en.wikipedia.org/wiki/Closure_(computer_programming)>) in other languages.
@@ -151,7 +151,7 @@ macro fun call_foo<$T, $U>($x: $T): &$U {
 }
 ```
 
-This macro will only expand succesfully if `$T` has a method `foo` that returns a reference `&$U`.
+This macro will only expand successfully if `$T` has a method `foo` that returns a reference `&$U`.
 As described in the [hygiene](#hygiene) section, `foo` will be resolved based on the scope where
 `call_foo` was defined--not where it was expanded.