Specify lowercase only for Galaxy namespaces (#67485)

* specify lowercase only for galaxy namespaces
* doh... include meta file

docs/docsite/rst/dev_guide/developing_collections.rst

@@ -339,7 +339,7 @@ Next, try using the local collection inside a playbook. For examples and more de
 Publishing collections
 ----------------------
 
-You can publish collections to Galaxy using the ``ansible-galaxy collection publish`` command or the Galaxy UI itself.
+You can publish collections to Galaxy using the ``ansible-galaxy collection publish`` command or the Galaxy UI itself. You need a namespace on Galaxy to upload your collection. See `Galaxy namespaces <https://galaxy.ansible.com/docs/contributing/namespaces.html#galaxy-namespaces>`_ on the Galaxy docsite for details.
 
 .. note:: Once you upload a version of a collection, you cannot delete or modify that version. Ensure that everything looks okay before you upload it.
 

lib/ansible/galaxy/data/collections_galaxy_meta.yml

@@ -10,7 +10,7 @@
   description:
   - The namespace of the collection.
   - This can be a company/brand/organization or product namespace under which all content lives.
-  - May only contain alphanumeric characters and underscores. Additionally namespaces cannot start with underscores or
+  - May only contain alphanumeric lowercase characters and underscores. Namespaces cannot start with underscores or
     numbers and cannot contain consecutive underscores.
   required: yes
   type: str