Re: [webauthn] Add "registration extension" and "authentication extension" to glossary

see: https://github.com/w3c/webauthn/pull/130#discussion-diff-67204868

wherein @vijaybh says:  Changed "signature extension" to 
"authentication extension" since we define registration and 
authentication to be our two ceremonies. I will open a new issue to 
add the terms to the glossary, since I am having trouble coming up 
with polished definitions right now.



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