Improve comments to better describe keg-only terminology

Co-authored-by: Shane Frasier <[email protected]>

Author: michaelsaki

CONTRIBUTING.md

@@ -68,7 +68,8 @@ installation is as simple as `brew install gnu-getopt pyenv pyenv-virtualenv` an
 adding this to your profile:
 
 ```bash
-# Enable GNU getopt since it is keg-only
+# GNU getopt must be explicitly added to the path since it is
+# keg-only
 export PATH="$(brew --prefix)/opt/gnu-getopt/bin:$PATH"
 
 # Setup pyenv

setup-env

@@ -73,7 +73,8 @@ if [[ $(getopt --version 2> /dev/null) != *"getopt from util-linux"* ]]; then
 
   export PATH="$(brew --prefix)/opt/gnu-getopt/bin:$PATH"
 
-  This will enable GNU getopt since it is keg-only.
+  GNU getopt must be explicitly added to the PATH since it
+  is keg-only.
 
 END_OF_LINE
   exit 1