Switch over to at-cmd form for references.

Sphinx anyway converts at_cmd to at-cmd for anchors in HTML so using at-cmd
consistently.

docs/conf.py

@@ -249,7 +249,7 @@ if you specify a program-to-run you can use the special placeholder
         from kitty.rc.base import cli_params_for
         for cmd_name in sorted(all_command_names()):
             func = command_for_name(cmd_name)
-            p(f'.. _at_{func.name}:\n')
+            p(f'.. _at-{func.name}:\n')
             p('kitty @', func.name)
             p('-' * 120)
             p('.. program::', 'kitty @', func.name)

docs/faq.rst

@@ -132,8 +132,8 @@ You can also define keyboard shortcuts to set colors, for example::
     map f1 set_colors --configured /path/to/some/config/file/colors.conf
 
 Or you can enable :doc:`remote control <remote-control>` for |kitty| and use
-:ref:`at_set-colors`. The shortcut mapping technique has the same syntax as the
-remote control command, for details, see :ref:`at_set-colors`.
+:ref:`at-set-colors`. The shortcut mapping technique has the same syntax as the
+remote control command, for details, see :ref:`at-set-colors`.
 
 To change colors when SSHing into a remote host, use the :opt:`color_scheme
 <kitten-ssh.color_scheme>` setting for the :doc:`ssh kitten <kittens/ssh>`.

docs/remote-control.rst

@@ -36,7 +36,7 @@ This will make ``Hello, World`` show up in the window running the :program:`cat`
 program. The :option:`kitty @ send-text --match` option is very powerful, it
 allows selecting windows by their titles, the command line of the program
 running in the window, the working directory of the program running in the
-window, etc. See :ref:`kitty @ send-text --help <at_send-text>` for details.
+window, etc. See :ref:`kitty @ send-text --help <at-send-text>` for details.
 
 More usefully, you can pipe the output of a command running in one window to
 another window, for example::