Document outline-minor-mode-cycle in the manual.

* doc/emacs/text.texi (Outline Mode): Document outline-minor-mode-cycle.

doc/emacs/text.texi

@@ -997,6 +997,12 @@ specific file (@pxref{File Variables}).
 major mode's special commands.  (The variable
 @code{outline-minor-mode-prefix} controls the prefix used.)
 
+  If the @code{outline-minor-mode-cycle} user option is
+non-@code{nil}, the @kbd{TAB} and @kbd{S-TAB} keys are enabled on the
+outline heading lines.  @kbd{TAB} cycles hiding, showing the
+sub-heading, and showing all for the current section.  @kbd{S-TAB}
+does the same for the entire buffer.
+
 @menu
 * Outline Format::      What the text of an outline looks like.
 * Outline Motion::      Special commands for moving through outlines.

etc/NEWS

@@ -479,6 +479,7 @@ Typing 'TAB' on a heading line cycles the current section between
 anywhere in the buffer cycles the whole buffer between "only top-level
 headings", "all headings and subheadings", and "show all" states.
 
++++
 *** New user option 'outline-minor-mode-cycle'.
 This user option customizes 'outline-minor-mode', with the difference
 that 'TAB' and 'S-TAB' on heading lines cycle heading visibility.