spotted a (or two) typos in addbookmark.sh and sendbookmark.sh

[ewingson]

in the commented out line 29 in addbookmarks.sh and 35 in sendbookmarks.sh (usage info) is a typo.
the code says "ifps:foo" must be "ipfs:foo" ?

although I' m github user, I' m new in collaboration, so forgive if there had been a simpler way to correct that. perhaps someone in the solid chat could introduce me to issues and pull requests.

just a comment