Search stream ISE should be renamed as Independent or Independent Submission

[kesara]

For Independent Submission stream documents, search (stream filter & RFC card) and "About this RFC" tab displays stream as ISE.

I think that should be renamed either Independent or Independent Submission because ISE is not a stream.

[holloway]

thoughts @ajeanmahoney ?

[ajeanmahoney]

The name of the publication stream is Independent Submission (RFC 8730) so we should go with that.