BUG: Patch from Miguel A. Figueroa-Villanueva for fixing documentation.

Source/cmIfCommand.h

@@ -123,12 +123,12 @@ public:
       "  IF(variable1 OR variable2)\n"
       "True if either variable would be considered true individually.\n"
       "  IF(COMMAND command-name)\n"
-      "True if the given name is a file or directory.\n"
+      "True if the given name is a command that can be invoked.\n"
       "  IF(EXISTS file-name)\n"
       "  IF(EXISTS directory-name)\n"
-      "True if the given name is a directory.\n"
-      "  IF(IS_DIRECTORY directory-name)\n"
       "True if the named file or directory exists.\n"
+      "  IF(IS_DIRECTORY directory-name)\n"
+      "True if the given name is a directory.\n"
       "  IF(variable MATCHES regex)\n"
       "  IF(string MATCHES regex)\n"
       "True if the given string or variable's value matches the given "