Fix misplaced control characters in docstring

Found by flymake.

init.el

@@ -49,12 +49,6 @@
 
 ;; * Packages
 
-(setq package-archives
-      '(("melpa" . "https://melpa.org/packages/")
-        ("gnu" . "https://elpa.gnu.org/packages/")
-        ("melpa-stable" . "https://stable.melpa.org/packages/")
-        ("nongnu" . "https://elpa.nongnu.org/nongnu/")))
-
 (defvar use-package-enable-imenu-support t)
 
 (require 'use-package)
@@ -69,8 +63,15 @@
         use-package-compute-statistics t
         debug-on-error t))
 
-(add-to-list 'package-pinned-packages '(use-package . "melpa-stable"))
-(add-to-list 'package-pinned-packages '(bind-key . "melpa-stable"))
+(use-package package
+  :init (setq package-archives
+              '(("melpa" . "https://melpa.org/packages/")
+                ("gnu" . "https://elpa.gnu.org/packages/")
+                ("melpa-stable" . "https://stable.melpa.org/packages/")
+                ("nongnu" . "https://elpa.nongnu.org/nongnu/")))
+  :config (progn
+            (add-to-list 'package-pinned-packages '(use-package . "melpa-stable"))
+            (add-to-list 'package-pinned-packages '(bind-key . "melpa-stable"))))
 
 
 ;; * Personal Customization Variables
@@ -1975,7 +1976,7 @@ Note that this workaround is incomplete, as explained in this comment."
             ;; tested with Outlook proper.
 
             (define-advice mml-smime-epg-sign (:after (cont) add-crlf-when-pkcs7)
-              "If CONT signifies encryption with smime, replace all \n with \r\n."
+              "If CONT signifies encryption with smime, replace all \\n with \\r\\n."
               (when (and (eq (car cont) 'part)
                          (string= "smime" (or (cdr (assq 'encrypt cont)) "")))
                 (db/convert-lf-to-crlf-in-buffer)))))