Homebrew-emacs-plus: Remove "linkapps" from "caveats" section

[zhengpd]

The brew linkapps command is no longer working. I think it's good to remove the brew linkapps part from the caveats section.

[jmromer]

Emacs.app was installed to:
  /usr/local/opt/emacs-plus

To link the application to default Homebrew App location:
  brew linkapps
or:
  ln -s /usr/local/opt/emacs-plus/Emacs.app /Applications

% brew linkapps
Error: Unknown command: linkapps

[d12frosted]

Done, removed it from there. Now there are two options:

• Use ln to link the application.
• Use Alfred (or any other similar software) to launch applications. Alfred allows to configure search paths, so I add /usr/local/Cellar to it's search path for Alfred to see Emacs.app without linking.