cmake: Upgrade 'cmake -E' commands description

Fixes: #13204

Help/manual/cmake.1.rst

@@ -390,16 +390,20 @@ Available commands are:
   Copy files to ``<destination>`` (either file or directory).
   If multiple files are specified, the ``<destination>`` must be
   directory and it must exist. Wildcards are not supported.
+  ``copy`` does follow symlinks. That means it does not copy symlinks,
+  but the files or directories it point to.
 
 ``copy_directory <dir>... <destination>``
   Copy directories to ``<destination>`` directory.
   If ``<destination>`` directory does not exist it will be created.
+  ``copy_directory`` does follow symlinks.
 
 ``copy_if_different <file>... <destination>``
   Copy files to ``<destination>`` (either file or directory) if
   they have changed.
   If multiple files are specified, the ``<destination>`` must be
   directory and it must exist.
+  ``copy_if_different`` does follow symlinks.
 
 ``echo [<string>...]``
   Displays arguments as text.
@@ -459,13 +463,16 @@ Available commands are:
   exist, the command returns a non-zero exit code, but no message
   is logged. The ``-f`` option changes the behavior to return a
   zero exit code (i.e. success) in such situations instead.
+  ``remove`` does not follow symlinks. That means it remove only symlinks
+  and not files it point to.
 
 ``remove_directory <dir>``
   Remove a directory and its contents.  If a directory does
   not exist it will be silently ignored.
 
 ``rename <oldname> <newname>``
-  Rename a file or directory (on one volume).
+  Rename a file or directory (on one volume). If file with the ``<newname>`` name
+  already exists, then it will be silently replaced.
 
 ``server``
   Launch :manual:`cmake-server(7)` mode.
@@ -494,10 +501,11 @@ Available commands are:
 ``time <command> [<args>...]``
   Run command and display elapsed time.
 
-``touch <file>``
-  Touch a file.
+``touch <file>...``
+  Creates ``<file>`` if file do not exist.
+  If ``<file>`` exists, it is changing ``<file>`` access and modification times.
 
-``touch_nocreate <file>``
+``touch_nocreate <file>...``
   Touch a file if it exists but do not create it.  If a file does
   not exist it will be silently ignored.
 

Source/cmcmd.cxx

@@ -111,8 +111,8 @@ void CMakeCommandUsage(const char* program)
     << "  tar [cxt][vf][zjJ] file.tar [file/dir1 file/dir2 ...]\n"
     << "                            - create or extract a tar or zip archive\n"
     << "  time command [args...]    - run command and display elapsed time\n"
-    << "  touch file                - touch a file.\n"
-    << "  touch_nocreate file       - touch a file but do not create it.\n"
+    << "  touch <file>...           - touch a <file>.\n"
+    << "  touch_nocreate <file>...  - touch a <file> but do not create it.\n"
     << "  create_symlink old new    - create a symbolic link new -> old\n"
 #if defined(_WIN32) && !defined(__CYGWIN__)
     << "Available on Windows only:\n"