gnu: emacs-helpful: Update to 0.18.

* gnu/packages/emacs-xyz.scm (emacs-helpful): Update to 0.18.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

gnu/packages/emacs-xyz.scm

@@ -15869,21 +15869,18 @@ downloading manager for Emacs.")
       (license license:gpl3+))))
 
 (define-public emacs-helpful
-  (let ((version "0.17")
-        (commit "b0e937fff71dc0a5d34066bfd25310e76f284621")
-        (revision "1"))
   (package
     (name "emacs-helpful")
-      (version (git-version version revision commit))
+    (version "0.18")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/Wilfred/helpful")
-               (commit commit)))
+             (commit version)))
        (file-name (git-file-name name version))
        (sha256
-          (base32 "048qvlyj2vkgi872z8l07diwqnq21ziycv8slxzzy7rflw3wx0b2"))))
+        (base32 "0gdjxykqkal2x765mi51m99i5ql23i1fy909wy4mzj5ajhjfgqcc"))))
     (build-system emacs-build-system)
     (propagated-inputs
      `(("emacs-elisp-refs" ,emacs-elisp-refs)
@@ -15918,7 +15915,7 @@ functions.
 @item Trace, disassemble functions from inside Helpful.  This is discoverable
 and doesn't require memorisation of commands.
 @end itemize\n")
-      (license license:gpl3+))))
+    (license license:gpl3+)))
 
 (define-public emacs-logview
   (package