Update doc/arkode/guide/source/Usage/LSRKStep/User_callable.rst

Co-authored-by: Daniel R. Reynolds <[email protected]>

doc/arkode/guide/source/Usage/LSRKStep/User_callable.rst

@@ -205,7 +205,7 @@ Optional output functions
 
    **Return value:**
       * *ARK_SUCCESS* if successful
-      * *ARK_MEM_NULL* if the ARKStep memory was ``NULL``     
+      * *ARK_MEM_NULL* if the LSRKStep memory was ``NULL``     
 
 
 .. c:function:: int LSRKStepGetMaxStageNum(void* arkode_mem, int* stagemax);