generate rst doc pages for command line tools (#27530)

* let generate_man also gen rst pages for cli tools
* make template-file, output-dir, output format cli options for generate_man
* update main Makefile to use generate_man.py for docs (man pages and rst)
* update vault docs that use :option:
* Edits based on
6e34ea6242 and
a3afc78535

* add a optparse 'desc' to lib/ansible/cli/config.py 

  The man page needs a short desc for the 'NAME' field
  which it gets from the option parse 'desc' value.

  Fixes building ansible-config man page.

* add trim_docstring from pep257 to generate_man

  use pep258 docstring trim function to fix up any indention
  weirdness inherit to doc strings (ie, lines other than
  first line being indented.

* Add refs to cli command actions

To reference ansible-vaults --vault-id option, use:

:option:`The link text here <ansible-vault --vault-id>`

or:

:option:`--vault-id <ansible-vault --vault-id>`

To reference ansible-vault's 'encrypt' action, use:

:ref:`The link text here <ansible_vault_encrypt>`

or most of the time:

:ref:`ansible-vault encrypt <ansible_vault_encrypt>`

lib/ansible/cli/config.py

@@ -56,7 +56,8 @@ class ConfigCLI(CLI):
 
         self.parser = CLI.base_parser(
             usage = "usage: %%prog [%s] [--help] [options] [ansible.cfg]" % "|".join(self.VALID_ACTIONS),
-            epilog = "\nSee '%s <command> --help' for more information on a specific command.\n\n" % os.path.basename(sys.argv[0])
+            epilog = "\nSee '%s <command> --help' for more information on a specific command.\n\n" % os.path.basename(sys.argv[0]),
+            desc="View, edit, and manage ansible configuration.",
         )
 
         self.parser.add_option('-c', '--config', dest='config_file', help="path to configuration file, defaults to first file found in precedence.")