docs: fix a few simple typos

There are small typos in:
- CODING_STYLE.md
- evennia/commands/cmdhandler.py
- evennia/commands/default/syscommands.py
- evennia/contrib/building_menu.py
- evennia/prototypes/prototypes.py

Fixes:
- Should read `traverse` rather than `traverese`.
- Should read `shortcuts` rather than `shorcuts`.
- Should read `multiple` rather than `multuple`.
- Should read `multiple` rather than `mulitple`.
- Should read `indentation` rather than `indendation`.

Closes #2420

evennia/prototypes/prototypes.py

@@ -653,7 +653,7 @@ def validate_prototype(
                 )
             )
 
-    # recursively traverese prototype_parent chain
+    # recursively traverse prototype_parent chain
 
     for protstring in make_iter(prototype_parent):
         protstring = protstring.lower()