Alias knockout -> k.o.

BUR #26316 has been rejected.

create alias knockout -> k.o.
create alias knock_out -> k.o.
category knock_out -> general

Essentially two tags for the exact same thing ("knockout" is usually shortened to K.O.). Also added spaced alias just in case.

topic #19893
knockout Post History
knock_out Post History

There doesn't seem to be a need for aliases. Fix isolated errors manually. If necessary, make tags (without a wiki) ambiguous.

This bulk update request is pending automatic rejection in 5 days.

post #7084703 and post #7553419 are for the sentence, post #5932916 is for someone getting knocked out. They're different things.

This bulk update request has been rejected because it was not approved within 45 days.

The bulk update request #26316 (forum #280889) has been rejected by @DanbooruBot.