small changes to section_keystone-token-binding file

changed such to so
changed some wording around sentence
added ,
removed the
added mode

Change-Id: I175ee91bcb67f03e6068d0df7f0924134b1b2816
plug-in needs a boost! :)

Replace plugin with plug-in in text.

Change-Id: I1209717446c11fd653a82840a24327a5a12e02b3
Merge "plug-in needs a boost! :)"
Merge "small changes to section_keystone-token-binding file"