bug#34518: Trivial documentation fix: name of 'add-variable-watcher'

[David Pathakjee <dpathakjee@gmail.com>]

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The docstring of debug-on-variable-change misnames `add-variable-watcher'. Patch attached.

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From 4f516c91f7fa947ba87c4647ba305d16ff027ef2 Mon Sep 17 00:00:00 2001
From: David Pathakjee <dpathakjee@gmail.com>
Date: Sun, 17 Feb 2019 16:08:33 -0800
Subject: [PATCH] Trivial docfix: real function name is `add-variable-watcher'.

---
 lisp/emacs-lisp/debug.el | 2 +-
 lisp/ldefs-boot.el       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
index 5c186f7019..3c47561317 100644
--- a/lisp/emacs-lisp/debug.el
+++ b/lisp/emacs-lisp/debug.el
@@ -744,7 +744,7 @@ This function is called when SYMBOL's value is modified."
 
 When called interactively, prompt for VARIABLE in the minibuffer.
 
-This works by calling `add-variable-watch' on VARIABLE.  If you
+This works by calling `add-variable-watcher' on VARIABLE.  If you
 quit from the debugger, this will abort the change (unless the
 change is caused by the termination of a let-binding).
 
diff --git a/lisp/ldefs-boot.el b/lisp/ldefs-boot.el
index f90815dc9b..744c2ae233 100644
--- a/lisp/ldefs-boot.el
+++ b/lisp/ldefs-boot.el
@@ -6851,7 +6851,7 @@ Trigger a debugger invocation when VARIABLE is changed.
 
 When called interactively, prompt for VARIABLE in the minibuffer.
 
-This works by calling `add-variable-watch' on VARIABLE.  If you
+This works by calling `add-variable-watcher' on VARIABLE.  If you
 quit from the debugger, this will abort the change (unless the
 change is caused by the termination of a let-binding).
 
-- 
2.18.0