Remove unimplemented options

[PaulWessel]

Will be mentioned in a separate Feature request. This PR reformats the -D, -N, -Q, and -S options to be more friendly, and comments out text and code related to the unimplemented options -Si|j|u.

Here is the new -D explanation:

Here is the new -N and -Q explanations:

Here is the new -S explanation:

[PaulWessel]

Why are the doc update getting stuck in CI and some fail, @seisman ? Am I doing something wrong?

[joa-quim]

It's a Homebrew error

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3
Target /usr/local/bin/2to3
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3'

To force the link and overwrite all conflicting files:
  brew link --overwrite [email protected]

[seisman]

It's a Homebrew error

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3
Target /usr/local/bin/2to3
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3'

To force the link and overwrite all conflicting files:
  brew link --overwrite [email protected]

Yes, the Linux one is still working.