Correct spelling mistakes.

code/qcommon/cmd.c

@@ -489,8 +489,8 @@ void Cmd_Args_Sanitize(void)
 Cmd_TokenizeString
 
 Parses the given string into command line tokens.
-The text is copied to a seperate buffer and 0 characters
-are inserted in the apropriate place, The argv array
+The text is copied to a separate buffer and 0 characters
+are inserted in the appropriate place, The argv array
 will point into this temporary buffer.
 ============
 */