Otherwise this is just doing `rubocop` checks.

This is no longer used anywhere.

Co-Authored-By: Mike McQuaid <mike@mikemcquaid.com>

- Muscle memory is a thing, as is relying heavily on one's shell
  history. Now that the Jenkins runners are gone, `brew pull --bottle`
  no longer works. This removes the option. If maintainers are confused,
  they should [look at recent changes to the
  docs](https://docs.brew.sh/Brew-Test-Bot-For-Core-Contributors#bottling),
  or ask in Slack.
- An earlier iteration of this showed a deprecation warning and a link
  to the docs, but when an option no longer physically works it's a bit
  late for deprecation *warnings*.
- This also fixes a `brew style` warning from futher up in the file.

pull: Appease RuboCop

also tweak usage to show that the commands accept multiple arguments

Co-Authored-By: Mike McQuaid <mike@mikemcquaid.com>

This fixes an issue where at least in Xcode 11.0, `make` uses
`/var/tmp` as a fallback for temporary files unless `TMPDIR` is set:

```
$ strings "$(xcrun -f make)" | grep -B 3 fopen
TMPDIR
/var/tmp/
GmXXXXXX
fopen (temporary file)
```

Given that Homebrew filtered `TMPDIR`, and the `/var/tmp` directory may
not be writable for non-root users, this would cause Homebrew’s
build environment to error out:

```
$ brew ruby -e 'puts ENV["TMPDIR"]; puts `: | make -f -`'
```

```
Ignoring bigdecimal-2.0.0 because its extensions are not built. Try: gem pristine bigdecimal --version 2.0.0
[…]
Ignoring zlib-1.1.0 because its extensions are not built. Try: gem pristine zlib --version 1.1.0
make: *** fopen (temporary file): Permission denied.  Stop.
```

In practice, this would break `brew audit`, `brew style`, and other
commands, which would run `make` to build native gem extensions.

This commit sets `TMPDIR` to `${HOMEBREW_TEMP}` in the gem environment, which
mirrors the behaviour we already have in other places.
We choose `HOMEBREW_TEMP` because that’s user-controlled but also falls
back to `/tmp` in case `TMPDIR` is not set in the user’s environment.

Thanks to Bo Anderson for helping find the bug.

CC: Bo Anderson <mail@boanderson.me>

This reverts commit fa359168.