become: Add missing documentation for pfexec, dzdo and machinectl (#53314)

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

docs/bin/plugin_formatter.py

@@ -554,7 +554,12 @@ def process_plugins(module_map, templates, outputname, output_dir, ansible_versi
 
         display.v('about to template %s' % module)
         display.vvvvv(pp.pformat(doc))
+        try:
             text = templates['plugin'].render(doc)
+        except Exception as e:
+            display.warning(msg="Could not parse %s due to %s" % (module, e))
+            continue
+
         if LooseVersion(jinja2.__version__) < LooseVersion('2.10'):
             # jinja2 < 2.10's indent filter indents blank lines.  Cleanup
             text = re.sub(' +\n', '\n', text)

lib/ansible/plugins/become/pfexec.py

@@ -80,6 +80,7 @@ DOCUMENTATION = """
             vars:
               - name: ansible_pfexec_wrap_execution
             env:
+              - name: ANSIBLE_PFEXEC_WRAP_EXECUTION
     note:
       - This plugin ignores ``become_user`` as pfexec uses it's own ``exec_attr`` to figure this out.
 """