Feat/language clarity media types

[mprorock]

adds and adjusts to ensure that we avoid key confusion, media type, and tls errors in use of did:web

[mprorock]

@mkhraisha might need to revisit after I merged @TallTed grammar corrections

[mkhraisha]

I reviewed Ted's changes, and mine have been included in his changes.

[OR13]

Open for 2 weeks, changes requested and accepted, merging.