[Fix #2049] Use view-mode for cider-grimoire buffer (#2050)

Author: xiongtx

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### New Features
 
+* [#2050](https://github.com/clojure-emacs/cider/pull/2050) Use `view-mode` for `cider-grimoire` buffers
 * Filter stacktrace to just frames from your project.
 * [#1918](https://github.com/clojure-emacs/cider/issues/1918): Add new commands `cider-browse-spec` and `cider-browse-spec-all` which start a spec browser.
 * [#2015](https://github.com/clojure-emacs/cider/pull/2015): Show symbols as special forms *and* macros in `cider-doc`

cider-grimoire.el

@@ -86,7 +86,7 @@ opposite of what that option dictates."
       (cider-popup-buffer-mode 1)
       (when (fboundp 'markdown-toggle-fontify-code-blocks-natively)
         (markdown-toggle-fontify-code-blocks-natively 1)))
-    (read-only-mode +1)
+    (view-mode 1)
     (goto-char (point-min))
     (current-buffer)))