Improve 'compilation-hidden-output' docstring

* lisp/progmodes/compile.el (compilation-hidden-output): Escape
the newline so the example value is more suitable for copying.

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index d2e74aa44a663235f0bf437b9b0f3ef71543fece..95dce7a430fb741bc02b892569b2fa7147e3f30a 100644 (file)
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -95,8 +95,8 @@ like.
 For instance, to hide the verbose output from recursive
 makefiles, you can say something like:
 
-  (setq compilation-hidden-output
-        \\='(\"^make[^\n]+\n\"))"
+  (setopt compilation-hidden-output
+          \\='(\"^make[^\\n]+\\n\"))"
   :type '(choice regexp
                  (repeat regexp))
   :version "29.1")