Add single quotes around package name (#45152)

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`pip install ansible[azure]` results in `zsh: no matches found: ansible[azure]` at least in my computer (zsh on Ubuntu). I don't know if it is the case with all shells, but at least for me it is. Since square brackets `[]` are special characters in bash, I propose adding single quotes to make sure that package name is always interpreted as literal. The same error is also resolvable by setting noglob.

docs/docsite/rst/scenario_guides/guide_azure.rst

@@ -12,7 +12,7 @@ installed on the host running Ansible.
 
 .. code-block:: bash
 
-    $ pip install ansible[azure]
+    $ pip install 'ansible[azure]'
 
 If you are running Ansible from source, you can install the dependencies from the
 root directory of the Ansible repo.