issue #2243 -- prefer f-strings over %-interpolation

edited docs to prefer f-strings, then str.format(), and remove %-interpolation

additional ad-hoc documentation fixes, as opportunities seen:
- replace Built-In Function (BIF) "min" variable with "mins"
- prefer BIF str(var) over "%s" % var
- reformat some code examples to clarify multiple args passed to functions
- change some single-quote strings to double-quotes for consistency
- fix mismatched parens

misc edits:
- add .vscode/ to gitignore

docs/source/Contribs/Dynamic-In-Game-Map.md

@@ -346,7 +346,7 @@ class Room(DefaultRoom):
     
     def return_appearance(self, looker):
         # [...]
-        string = "%s\n" % Map(looker).show_map()
+        string = f"{Map(looker).show_map()}\n"
         # Add all the normal stuff like room description, 
         # contents, exits etc. 
         string += "\n" + super().return_appearance(looker)