org-agenda: Fix exiting function docstrings

* lisp/org-agenda.el (org-agenda-Quit):
* lisp/org-agenda.el (org-agenda-quit):
* lisp/org-agenda.el (org-agenda-exit): Correct and expand docstrings.

lisp/org-agenda.el

@@ -7173,8 +7173,9 @@ Allowed types are 'agenda 'timeline 'todo 'tags 'search."
 	nil))))
 
 (defun org-agenda-Quit ()
-  "Exit the agenda and kill buffers loaded by `org-agenda'.
-Also restore the window configuration."
+  "Exit the agenda, killing the agenda buffer.
+Like `org-agenda-quit', but kill the buffer even when
+`org-agenda-sticky' is non-nil."
   (interactive)
   (if org-agenda-columns-active
       (org-columns-quit)
@@ -7202,8 +7203,16 @@ Also restore the window configuration."
 	 (setq org-agenda-pre-window-conf nil))))
 
 (defun org-agenda-quit ()
-  "Exit the agenda and restore the window configuration.
-When `org-agenda-sticky' is non-nil, only bury the agenda."
+  "Exit the agenda.
+
+When `org-agenda-sticky' is non-nil, bury the agenda buffer
+instead of killing it.
+
+When `org-agenda-restore-windows-after-quit' is non-nil, restore
+the pre-agenda window configuration.
+
+When column view is active, exit column view instead of the
+agenda."
   (interactive)
   (if (and (eq org-indirect-buffer-display 'other-window)
 	   org-last-indirect-buffer)
@@ -7232,9 +7241,10 @@ When `org-agenda-sticky' is non-nil, only bury the agenda."
       (org-agenda-Quit))))
 
 (defun org-agenda-exit ()
-  "Exit the agenda and restore the window configuration.
-Also kill Org-mode buffers loaded by `org-agenda'.  Org-mode
-buffers visited directly by the user will not be touched."
+  "Exit the agenda, killing Org buffers loaded by the agenda.
+Like `org-agenda-Quit', but kill any buffers that were created by
+the agenda.  Org buffers visited directly by the user will not be
+touched."
   (interactive)
   (org-release-buffers org-agenda-new-buffers)
   (setq org-agenda-new-buffers nil)