[add] information for collection renaming

[ll-zerr]

Create a section that details how to rename a collection once it has been established.
Examples of this scenario are:

• Assessment.Survey renamed to NeedsAssessment.Survey (changing the higher level/umbrella concept name)
• Financial.Currency renamed to Financial.CurrencyConversions (changing the lower level/aspect name)

Add a link to this section in the table of contents for the collections.md