Fix up version added for return value in plugin template

[jborean93]

The indentation was broken for any return value with the version_added field. An example was on the ansible.windows win_environment module that was changed to https://github.com/ansible-collections/ansible.windows/commit/b8bdc06f817913d025cdaa7c65dad0af55d1d4fe#diff-cdd7d9bbe1aea346b11bcc4076ce696466692aba3d67b543c312e4f4ffa5c9f6.

The doc looked like the following because the div wasn't indented

This fixes up the indentation so now it aligns with the cell contents.