Don't quote nil and t in doc strings

This is as per "Tips for Documentation Strings" in the elisp manual.
For consistency, do the same in diagnostics and comments.

3 files changed, 3 insertions, 3 deletions

diff --git a/test/automated/data/package/newer-versions/simple-single-1.4.el b/test/automated/data/package/newer-versions/simple-single-1.4.el
index 7d8178c05a5..7b1c00c06db 100644
--- a/test/automated/data/package/newer-versions/simple-single-1.4.el
+++ b/test/automated/data/package/newer-versions/simple-single-1.4.el
@@ -19,7 +19,7 @@
 
 (defcustom simple-single-super-sunday nil
   "How great is this?
-Default changed to `nil'."
+Default changed to nil."
   :type 'boolean
   :group 'simple-single
   :package-version "1.4")
diff --git a/test/automated/file-notify-tests.el b/test/automated/file-notify-tests.el
index 8e3a7918c80..46d287fe60d 100644
--- a/test/automated/file-notify-tests.el
+++ b/test/automated/file-notify-tests.el
@@ -72,7 +72,7 @@
 (defun file-notify--test-local-enabled ()
   "Whether local file notification is enabled.
 This is needed for local `temporary-file-directory' only, in the
-remote case we return always `t'."
+remote case we return always t."
   (or file-notify--library
       (file-remote-p temporary-file-directory)))
 
diff --git a/test/automated/package-test.el b/test/automated/package-test.el
index ed2e3cf25aa..677bfa613fc 100644
--- a/test/automated/package-test.el
+++ b/test/automated/package-test.el
@@ -124,7 +124,7 @@
           ,@(if upload-base
                 '((package-test-archive-upload-base (make-temp-file "pkg-archive-base-" t))
                   (package-archive-upload-base package-test-archive-upload-base))
-              (list (cl-gensym)))) ;; Dummy value so `let' doesn't try to bind `nil'
+              (list (cl-gensym)))) ;; Dummy value so `let' doesn't try to bind nil
      (let ((buf (get-buffer "*Packages*")))
        (when (buffer-live-p buf)
          (kill-buffer buf)))