Update kinit(1) to include missing options.

[felix.the.red_gmail.com]

Summary

In response to PR 267963, add several options available in kinit help that were missing from the man page.
Also, correct some minor formatting issues.

[ziaee]

Same as kdigest, you wanna send this one to the heimdal upstream repo I mentioned in the other thread.

[felix.the.red_gmail.com]

I spent two hours trying to figure out how to submit a patch to upstream, and was unsuccessful.
Let this patch fall on the floor.

[ziaee]

Fork the heimdal repo
git clone your fork
git branch yourbranch
git switch yourbranch
Edit
git commit -a
git push origin
Then go to that link I posted, and you will see a little button that asks you if you want to contribute.