vim: update Ferret submodule
vim: update Ferret submodule

* roles/dotfiles/files/.vim/pack/bundle/start/ferret 4cc2a2f...0ce7514 (10):
  > Add missing docs for g:FerretQFHandler
  > doc: add missing documentation for old options and commands
  > doc: make function references into links
  > doc: make links to options actually links
  > doc: improve readability of "Overrides" section
  > doc: remove excess trailing parens
  > Avoid leading whitespace in default `ag` arguments list
  > Add g:FerretExecutableArguments and ferret#get_default_arguments()
  > Add --no-config to default rg options
  > Don't repeat executable name in s:executables values

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