revert action loader changes to doc, due to error

restoring behaviour in which a missing module is a warning that shows paths searched,
patch incorrectly bypassed detection and ended up in an exception: global name 'module' is not defined

lib/ansible/cli/doc.py

@@ -124,8 +124,6 @@ class DocCLI(CLI):
             try:
                 # if the plugin lives in a non-python file (eg, win_X.ps1), require the corresponding python file for docs
                 filename = loader.find_plugin(plugin, mod_type='.py', ignore_deprecated=True)
-                if filename is None and loader == module_loader:
-                    filename = action_loader.find_plugin(module, mod_type='.py')
                 if filename is None:
                     display.warning("%s %s not found in %s\n" % (plugin_type, plugin, DocCLI.print_paths(loader)))
                     continue
@@ -219,8 +217,6 @@ class DocCLI(CLI):
             # if the module lives in a non-python file (eg, win_X.ps1), require the corresponding python file for docs
             filename = loader.find_plugin(plugin, mod_type='.py', ignore_deprecated=True)
 
-            if filename is None and loader == module_loader:
-                filename = action_loader.find_plugin(module, mod_type='.py')
             if filename is None:
                 continue
             if filename.endswith(".ps1"):