Documentation: May want to add the "Walk Multipart Email" requirement on dependent commands

[xtalker]

The below multipart commands apparently require that the cache to be loaded first:

multipart keywords: Get Multipart Content Type, Get Multipart Field, Get Multipart Field Names, Get Multipart Field, and Get Multipart Payload.

If this requirement was documented with each of the above commands it sure would have saved me some time!