scripts: west commands: add text for "west --help"

Although each of these command implementations has good output for
"west <command> --help", the "west --help" output is missing the
one-line descriptions.

Add them by modifying west-commands.yml to use a new 'help' key in
each command name. These need to be kept in sync with the Python
sources. For now just do that by copy/pasting. We could add fancy
logic to load the help from west-commands.yml later if we want.

Signed-off-by: Marti Bolivar <marti@foundries.io>
diff --git a/scripts/west_commands/debug.py b/scripts/west_commands/debug.py
index 5361531..afb738e 100644
--- a/scripts/west_commands/debug.py
+++ b/scripts/west_commands/debug.py
@@ -17,6 +17,7 @@
     def __init__(self):
         super(Debug, self).__init__(
             'debug',
+            # Keep this in sync with the string in west-commands.yml.
             'flash and interactively debug a Zephyr application',
             dedent('''
             Connect to the board, program the flash, and start a
@@ -37,6 +38,7 @@
     def __init__(self):
         super(DebugServer, self).__init__(
             'debugserver',
+            # Keep this in sync with the string in west-commands.yml.
             'connect to board and launch a debug server',
             dedent('''
             Connect to the board and launch a debug server which accepts
@@ -55,11 +57,13 @@
         do_run_common(self, my_args, runner_args,
                       'ZEPHYR_BOARD_DEBUG_RUNNER')
 
+
 class Attach(WestCommand):
 
     def __init__(self):
         super(Attach, self).__init__(
             'attach',
+            # Keep this in sync with the string in west-commands.yml.
             'interactively debug a board',
             dedent('''
             Like 'debug', this connects to the board and starts a debugging