docs: improve wording

Co-authored-by: Tom McCarthy <[email protected]>

docs/utilities/parser.md

@@ -170,7 +170,7 @@ Parser comes with the following built-in models:
 
 You can extend them to include your own models, and yet have all other known fields parsed along the way.
 
-!!! tip "For Mypy customers, we only allow type override for fields where payload is injected e.g. `detail`, `body`, etc."
+!!! tip "For Mypy users, we only allow type override for fields where payload is injected e.g. `detail`, `body`, etc."
 
 **EventBridge example**