commands: fix some docstrings

When interpreted as restructured text, these are causing errors
because the '**' is interpreted as the start of a bold section, which
never ends. This causes build failures in the zephyr docs, which do
treat these as RST.

Wrap them in `` to make the whole thing a literal block to fix this
issue.

Signed-off-by: Martí Bolívar <mbolivar@amperecomputing.com>

src/west/commands.py

@@ -303,21 +303,21 @@ def _log_subproc(self, args, **kwargs):
     #
 
     def check_call(self, args, **kwargs):
-        '''Runs subprocess.check_call(args, **kwargs) after
+        '''Runs ``subprocess.check_call(args, **kwargs)`` after
         logging the call at Verbosity.DBG_MORE level.'''
 
         self._log_subproc(args, **kwargs)
         subprocess.check_call(args, **kwargs)
 
     def check_output(self, args, **kwargs):
-        '''Runs subprocess.check_output(args, **kwargs) after
+        '''Runs ``subprocess.check_output(args, **kwargs)`` after
         logging the call at Verbosity.DBG_MORE level.'''
 
         self._log_subproc(args, **kwargs)
         return subprocess.check_output(args, **kwargs)
 
     def run_subprocess(self, args, **kwargs):
-        '''Runs subprocess.run(args, **kwargs) after logging
+        '''Runs ``subprocess.run(args, **kwargs)`` after logging
         the call at Verbosity.DBG_MORE level.'''
 
         self._log_subproc(args, **kwargs)