Documentation fix

[Po Lu <luangruo@yahoo.com>]

Would someone who can please install the following change to emacs-29?
Savannah seems to be down again.

2023-04-07  Po Lu  <luangruo@yahoo.com>

	* doc/lispref/frames.texi (Drag and Drop): Fix
	description of `x-dnd-direct-save-function'.

diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
index 9083b4b01c9..fd3bf67cf9f 100644
--- a/doc/lispref/frames.texi
+++ b/doc/lispref/frames.texi
@@ -4177,19 +4177,25 @@ Drag and Drop
   However, @code{x-dnd-types-alist} does not handle a special kind of
 drop sent by a program that wants Emacs to tell it where to save a
 file in a specific location determined by the user.  These drops are
-instead handled by a function that is the value of the variable
-@code{x-dnd-direct-save-function}.  This function should accept two arguments.
-If the first argument is non-@code{nil}, then the second argument is a
-file name to save (with leading directories) that the other
-program recommends, and the
-function should return the full file name under which it should be
-saved.  After the function completes, Emacs will ask the other program
-to save the file under the name that was returned, and if the file was
-successfully saved, call the function again with the first argument
-set to a non-@code{nil} value and the second argument set to the file
-name that was returned.  The function should then perform whatever
-action is appropriate (i.e., opening the file or refreshing a
-directory listing.)
+instead handled by a function determined by the variable
+@code{x-dnd-direct-save-function}.  This function is essentially two
+functions in one---its first argument is a boolean which tells it what
+operations to perform.
+
+  When the drop takes place, the function is first called with its
+first argument set to a non-@code{nil} value, and its second argument
+set to a file name that the file should be saved under; this file name
+does not contain the directory under which the file should be saved.
+
+  The function should return the complete file name under which the
+file should be saved, including the directory where it should be
+saved, under which Emacs will ask the other program to save the file.
+
+  If the file was successfully saved, the function is called again,
+this time with the first argument set to @code{nil}, and the second
+argument set to the file name that was returned.  The function should
+then perform whatever action is appropriate (i.e., opening the file or
+refreshing a directory listing.)
 
 @cindex initiating drag-and-drop
   On capable window systems, Emacs also supports dragging contents