Rename TypehaeadUserParameterizedDatasource to PeopleUserFunctionDatasource
Summary: Ref T4100. This improves application scoping (Typeahead -> People) and uses a more consitent and concise name (Parameterized -> Function).
Test Plan:
- grep
- Used affected datasource.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4100
Differential Revision: https://secure.phabricator.com/D12532