project-kill-buffers: Update the docstring too

* lisp/progmodes/project.el (project-kill-buffers):
Copy a sentence over from project-switch-to-buffer.

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index 293ef0b35082b595e1724c3c09357f722e580124..5be89b9ceb665754e56002bb294fdb3e3925606e 100644 (file)
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -860,6 +860,8 @@ any of the conditions will not be killed."
 ;;;###autoload
 (defun project-kill-buffers ()
   "Kill all live buffers belonging to the current project.
+Two buffers belong to the same project if their project instances,
+as reported by `project-current' in each buffer, are identical.
 Certain buffers may be \"spared\", see `project-kill-buffers-ignores'."
   (interactive)
   (let ((pr (project-current t)) bufs)