Fix incorrect alias-management info in !command docs

[rabeles11]

Summary

• Corrected the alias subcommand docs: aliases can be added via chat using !command alias add !<command_name> !<alias_name>, not just viewed. The previous docs incorrectly stated
  alias management was Dashboard-only.
• Added syntax/examples for !command alias add and !command alias remove.
• Added a note that listing aliases (!command alias !<command_name>) only works with the original command name, not one of its aliases.
• Updated the FAQ entry that repeated the same inaccurate "Dashboard only" claim to instead document the alias add/remove syntax.

Why

Docs previously said aliases could only be created/managed via the StreamElements Dashboard. That's incorrect — aliases can be managed directly through the !command alias chat
command.

Closes#83

[c4ldas]

That's great!
Since the !alias command also supports removing and listing aliases via chat, it would be great to include those options as well.
Could you add the following to the aliassection?

• Remove an alias :
  !command alias remove !command_name !alias_name

• Show aliases for specific command (original command only)
  !command alias !command_name

Also, you can also add that it closes #83

[rabeles11]

That's great! Since the !alias command also supports removing and listing aliases via chat, it would be great to include those options as well. Could you add the following to the aliassection?

* Remove an alias :
`!command alias remove !command_name !alias_name`
* Show aliases for specific command (original command only)
`!command alias !command_name`

Also, you can also add that it closes #83

Updated

[rabeles11]

Any update? on that PR? @c4ldas

[c4ldas]

Any update? on that PR? @c4ldas

I'm not part of the staff, so I don't have any power over this PR. Maybe @styler can help with that?

[styler]

Thanks for catching this, that note has been wrong for a while. LGTM