Remove unnecessary single quotes from doc examples

Proposal

I recently had a discussion about the inclusion of single quotation marks in a template and whether they were necessary. In the discussion, the job control docs were referenced as using single quotation marks in the examples, however, it looks like there's not much consistency in the docs, sometimes single quotes are used and sometimes they aren't.

The purpose of this issue is to update the docs and remove these unnecessary single quotes, in order to provide consistent code examples.

Further details

Please see this dicsussion for more details on which files need to be changed.