doc/org-manual.org: Document org-clock-{in,out}-switch-to-state

* doc/org-manual.org (Clocking commands): Document operation of
org-clock-{in,out}-switch-to-state.

doc/org-manual.org

@@ -6583,6 +6583,27 @@ about what to do with it.
   C-u C-u)}}} prefixes, force continuous clocking by starting the
   clock when the last clock stopped.
 
+  #+vindex: org-clock-in-switch-to-state
+  The variable ~org-clock-in-switch-to-state~ controls how a current
+  task's TODO state is changed on clock-in.  No change (a ~nil~) is
+  the default.  A specific state may be forced with a string value.
+  Additionally, a function which takes a current state and returns
+  either a new state or ~nil~ for no change may be used.  Finally, an
+  alist may be used to provide a mapping from state to state.
+  Consider the following example, where ~TODO~ becomes ~WORKING~, and
+  ~WAITING~ becomes ~WORKING~ on clock-in.
+
+  #+begin_src emacs-lisp
+  (setf org-clock-in-switch-to-state '(("TODO" . "WORKING")
+                                       ("WAITING" . "WORKING")))
+  #+end_src
+
+  The
+  ~org-clock-in-next-state~ alist may be utilized by setting it to
+  ~org-clock-in-next-state-function~, or a custom function may be
+  used.  This custom function should take the current state, and
+  return either a new state or ~nil~ to keep the current state.
+
   #+cindex: @samp{CLOCK_MODELINE_TOTAL}, property
   #+cindex: @samp{LAST_REPEAT}, property
   #+vindex: org-clock-mode-line-total
@@ -6618,6 +6639,10 @@ about what to do with it.
   timestamp[fn:: The corresponding in-buffer setting is: =#+STARTUP:
   lognoteclock-out=.].
 
+  #+vindex: org-clock-out-switch-to-state
+  The variable ~org-clock-out-switch-to-state~ may be configured
+  similarly to ~org-clock-in-switch-to-state~.
+  
 - {{{kbd(C-c C-x C-x)}}} (~org-clock-in-last~) ::
 
   #+kindex: C-c C-x C-x