Example for Checks in the commands documentation makes no sense (rewrite)

[merlinfuchs]

• There is only one check, but the example should show off multiple checks
• is_in_guild should be predicate

https://discordpy.readthedocs.io/en/rewrite/ext/commands/commands.html#checks

[crrapi]

See #1720

[crrapi]

There is only one check, but the example should show off multiple checks

I don't think this is really necessary, as simply stating it should suffice.

[MusicOnline]

The next line after the example is

If any of those checks fail in the example above, then the command will not be run.

An inaccurate example would only bring confusion.