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/Components/Web-API.md

@@ -102,7 +102,7 @@ and static files.
 - The api code is located in `evennia/web/api/` - the `url.py` file here is responsible for
   collecting all view-classes.
 
-Contrary to other web components, there is no pre-made urls.py set up for
+Contrary to other web components, there is no pre-made `urls.py` set up for
 `mygame/web/api/`. This is because the registration of models with the api is
 strongly integrated with the REST api functionality. Easiest is probably to
 copy over `evennia/web/api/urls.py` and modify it in place.