Handbook: Show published date and last updated date below the title

[jdy68]

Follow up to ticket #5222

Ocean 90, it's a good idea and we're happy that the functionality now exists in the handbooks. Thanks.
In our French locale (fr_FR), we had already set up a block in which the update date was indicated. On the other hand, we place this block just under the title because this information is very important in a documentation on a tool like WordPress that is constantly evolving.
What could be more annoying to read a whole article on a feature and to realize at the end of reading that the article you just read was written (or updated) 3 years ago, for example, and to wonder if the information is still relevant and corresponds to the current functioning of the tool.

To improve this addition of publication/update dates, we suggest placing them below the title so that it is visible from the start of reading, which enriches the documentation and makes it more efficient for users.

[jdy68]

Handbook: publication or update date below the title