docs(index.md): punctuation & capitalisation

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# Expressions # Expressions
Expressions allow you to write custom Logic using Python code. Expressions allow you to write custom logic using Python code.
Expressions are used in different places throughout passbook, and can do different things. Expressions are used in different places throughout passbook, and can do different things.
@ -46,7 +46,7 @@ return pb_is_group_member(request.user, name="test_group")
### `pb_user_by(**filters) -> Optional[User]` ### `pb_user_by(**filters) -> Optional[User]`
Fetch a user matching `**filters`. Returns None if no user was found. Fetch a user matching `**filters`. Returns "None" if no user was found.
Example: Example: