* lisp/files.el (find-file-literally): Doc fix.

lisp/files.el

@@ -2342,10 +2342,15 @@ and local variable specifications in the file are ignored.
 Automatic uncompression and adding a newline at the end of the
 file due to `require-final-newline' is also disabled.
 
-You cannot absolutely rely on this function to result in
-visiting the file literally.  If Emacs already has a buffer
-which is visiting the file, you get the existing buffer,
-regardless of whether it was created literally or not.
+If Emacs already has a buffer which is visiting the file,
+this command asks you whether to visit it literally instead.
+
+In non-interactive use, the value is the buffer where the file is
+visited literally.  If the file was visited in a buffer before
+this command was invoked, it will reuse the existing buffer,
+regardless of whether it was created literally or not; however,
+the contents of that buffer will be the literal text of the file
+without any conversions.
 
 In a Lisp program, if you want to be sure of accessing a file's
 contents literally, you should create a temporary buffer and then read