gcp: documentation update (#50183)

* gcp: documentation update

* Update example about dynamic inventory
* minor typo fixes in gcp_utils
* Additional information about enabling inventory plugin in ansible.cfg

partially fixes: #44404

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

docs/docsite/rst/scenario_guides/guide_gce.rst

@@ -127,8 +127,16 @@ GCE Dynamic Inventory
 
 The best way to interact with your hosts is to use the gcp_compute inventory plugin, which dynamically queries GCE and tells Ansible what nodes can be managed.
 
-To use the gcp_compute inventory plugin, create a file that ends in .gcp.yml file in your root directory. The gcp_compute inventory script takes in the same authentication
-information as any module.
+To be able to use this GCE dynamic inventory plugin, you need to enable it first by specifying the following in the ``ansible.cfg`` file:
+
+.. code-block:: ini
+
+  [inventory]
+  enable_plugins = gcp_compute
+
+Then, create a file that ends in ``.gcp.yml`` in your root directory.
+
+The gcp_compute inventory script takes in the same authentication information as any module.
 
 Here's an example of a valid inventory file:
 
@@ -136,7 +144,7 @@ Here's an example of a valid inventory file:
 
     plugin: gcp_compute
     projects:
-      - google.com:graphite-playground
+      - graphite-playground
     filters:
     auth_kind: serviceaccount
     service_account_file: /home/alexstephen/my_account.json

lib/ansible/module_utils/gcp_utils.py

@@ -63,7 +63,7 @@ def replace_resource_dict(item, value):
         return item.get(value)
 
 
-# Handles all authentation and HTTP sessions for GCP API calls.
+# Handles all authentication and HTTP sessions for GCP API calls.
 class GcpSession(object):
     def __init__(self, module, product):
         self.module = module
@@ -114,12 +114,12 @@ class GcpSession(object):
 
         if self.module.params.get('service_account_email') is not None and self.module.params['auth_kind'] != 'machineaccount':
             self.module.fail_json(
-                msg="Service Acccount Email only works with Machine Account-based authentication"
+                msg="Service Account Email only works with Machine Account-based authentication"
             )
 
         if self.module.params.get('service_account_file') is not None and self.module.params['auth_kind'] != 'serviceaccount':
             self.module.fail_json(
-                msg="Service Acccount File only works with Service Account-based authentication"
+                msg="Service Account File only works with Service Account-based authentication"
             )
 
     def _credentials(self):
@@ -134,7 +134,7 @@ class GcpSession(object):
             return google.auth.compute_engine.Credentials(
                 self.module.params['service_account_email'])
         else:
-            self.module.fail_json(msg="Credential type '%s' not implmented" % cred_type)
+            self.module.fail_json(msg="Credential type '%s' not implemented" % cred_type)
 
     def _headers(self):
         return {