Add PATCH method for all Entities

[sophiacrennan]

Problem: We want a PATCH method to update our data
Solution: add patch method to all controllers

Description: After removing explicit foreign keys, our data has null for some foreign keys. The patch method will update our data which will fix all of our data to know have information about every foreign key.

Specs:

• Add patch method in every entity's controller
• update routes
• update documentation

If blocked, contact @emaela or @sophiacrennan