Document workflow fails when RoxygenNote: is out of date in the DESCRIPTION

[Moohan]

Describe the bug
Document workflow can modify the DESCRIPTION file (by updating the Roxygen version note) but it won't commit the change. This leads to a build error when there is nothing else to commit.

To Reproduce
failed build

Run the action on a package which is 'properly' documented but has an older roxygen version in the DESCRIPTION

Expected behaviour
Commit the change to the DESCRIPTION. Or do nothing but don't fail if only the DESCRIPTION is to be changed.

[dpprdan]

I think this is fixed now due to the changes in #694. @Moohan can you please try those out and report back?

[gaborcsardi]

I assume that this is fixed now. Thanks for the PR!

[github-actions]

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