Update shortcuts. documentation (PR #2325)
Update shortcuts. documentation (PR #2325)

Document Qt shortcuts, change referencing "image" to "media", clarify that these are defaults, added new shortcuts currently in Develop, resorted shortcuts to match options window.
Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber