[3.13] Trivial change: Update comments in activate about what running…

… hash -r does (GH-125385) (GH-125387)

(cherry picked from commit 82bcaf1)

Lib/venv/scripts/common/activate

@@ -14,8 +14,9 @@ deactivate () {
  unset _OLD_VIRTUAL_PYTHONHOME
  fi
 
- # Call hash to forget past commands. Without forgetting
- # past commands the $PATH changes we made may not be respected
+ # Call hash to forget past locations. Without forgetting
+ # past locations the $PATH changes we made may not be respected.
+ # See "man bash" for more details. hash is usually a builtin of your shell
  hash -r 2> /dev/null
 
  if [ -n "${_OLD_VIRTUAL_PS1:-}" ] ; then