(syms_of_xdisp) <auto-resize-tool-bars>: Fix typo in docstring.

src/xdisp.c

@@ -24137,7 +24137,7 @@ unselects the minibuffer if it is active.  */);
 This dynamically changes the tool-bar's height to the minimum height
 that is needed to make all tool-bar items visible.
 If value is `grow-only', the tool-bar's height is only increased
-automatically; to decreace the tool-bar height, use \\[recenter].  */);
+automatically; to decrease the tool-bar height, use \\[recenter].  */);
   Vauto_resize_tool_bars = Qt;
   DEFVAR_BOOL ("auto-raise-tool-bar-buttons", &auto_raise_tool_bar_buttons_p,