git-flow: Removing bundled ZSH completion and add caveat on alternative.
git-flow: Removing bundled ZSH completion and add caveat on alternative.

The file in `/usr/local/share/zsh/site-functions` needs to be called `_git-flow` have `"#compdef git-flow"` at the top.
The bundled autocomplete installation does not have that. Original PR would create a copy, with a symlink and prepend said line.

Closes #93187.

Signed-off-by: Carlo Cabrera <3ffc397d0e4bded29cb84b56167de54c01e3a55b@users.noreply.github.com>
Signed-off-by: Sean Molenaar <2b250e3fea88cfef248b497ad5fc17f7dc435154@users.noreply.github.com>
Signed-off-by: BrewTestBot <8a898ee6867e4f2028e63d2a6319b2224641c06c@users.noreply.github.com>

adam-moss/homebrew-core,adam-moss/homebrew-core,cblecker/homebrew-core,nandub/homebrew-core,Homebrew/homebrew-core,mfikes/homebrew-core,stgraber/homebrew-core,cblecker/homebrew-core,zyedidia/homebrew-core,nbari/homebrew-core,makigumo/homebrew-core,filcab/homebrew-core,chrisfinazzo/homebrew-core,sjackman/homebrew-core,lemzwerg/homebrew-core,uyjulian/homebrew-core,Homebrew/homebrew-core,sjackman/homebrew-core,stgraber/homebrew-core,lemzwerg/homebrew-core,nandub/homebrew-core,chrisfinazzo/homebrew-core,zyedidia/homebrew-core,nbari/homebrew-core,mfikes/homebrew-core,filcab/homebrew-core,makigumo/homebrew-core,uyjulian/homebrew-core