fix: remove erroneous links from the documentation

Sphinx assumes that WORD.py should be a link to https://WORD.py .

This is not a problem in most of the documentation, since Sphinx won't
turn those python filenames into links when they are wrapped in
backticks, like `WORD.py`. Unfortunately, not always that was being
done, and so there were several wrong, broken links in the
documentation.

This patch wraps all the occurrences I've found of this case with
backticks, not only making the documentation more readible and
homogeneous, but more importantly getting rid of those unwanted links
in the generated HTML version of the documentation.

docs/source/Setup/Settings.md

@@ -55,5 +55,5 @@ Apart from the main `settings.py` file,
 
 Some other Evennia systems can be customized by plugin modules but has no explicit template in `conf/`:
 
-- *cmdparser.py* - a custom module can be used to totally replace Evennia's default command parser. All this does is to split the incoming string into "command name" and "the rest". It also handles things like error messages for no-matches and multiple-matches among other things that makes this more complex than it sounds. The default parser is *very* generic, so you are most often best served by modifying things further down the line (on the command parse level) than here.
-- *at_search.py* - this allows for replacing the way Evennia handles search results. It allows to change how errors are echoed and how multi-matches are resolved and reported (like how the default understands that "2-ball" should match the second "ball" object if there are two of them in the room).
+- `cmdparser.py` - a custom module can be used to totally replace Evennia's default command parser. All this does is to split the incoming string into "command name" and "the rest". It also handles things like error messages for no-matches and multiple-matches among other things that makes this more complex than it sounds. The default parser is *very* generic, so you are most often best served by modifying things further down the line (on the command parse level) than here.
+- `at_search.py` - this allows for replacing the way Evennia handles search results. It allows to change how errors are echoed and how multi-matches are resolved and reported (like how the default understands that "2-ball" should match the second "ball" object if there are two of them in the room).