Where it made sense in the titles, and references in the documentation,
I have updated to just `Manual` over `Manual Page` for clarity on the
purpose of the section or documentation. I have left the file naming
alone, since that was mostly used in the links and felt like the titles
might be where more confusion could be at.
In intro documentation, it can be confusing to see just `man` for
the reference to reference manual pages and documentation. I believe this is a reference
to Unix man pages (manual pages), but markdown is much more than what those ASCII text displays could do.
To help understandability, I am submitting a PR to update some documentation references to manual over man.
