DEV: update comments on unused Uploads. -4 is now considered reserved. (#14362)

DEV: update comments on unused Uploads. -4 is now considered reserved. (#14362)

diff --git a/db/fixtures/010_uploads.rb b/db/fixtures/010_uploads.rb
index b36012e..aea24a6 100644
--- a/db/fixtures/010_uploads.rb
+++ b/db/fixtures/010_uploads.rb
@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
 {
-  -1 => "d-logo-sketch.png", # Old version
-  -2 => "d-logo-sketch-small.png", # Old version
-  -3 => "default-favicon.ico", # No longer used
-  -4 => "default-apple-touch-icon.png", # No longer used
+  -1 => "d-logo-sketch.png", # Old version.
+  -2 => "d-logo-sketch-small.png", # Old version.
+  -3 => "default-favicon.ico", # No longer used.
+  -4 => "default-apple-touch-icon.png", # No longer used. id of `-4` is now reserved for internal plugin usage.
   -5 => "discourse-logo-sketch.png",
   -6 => "discourse-logo-sketch-small.png",
 }.each do |id, filename|

GitHub sha: ae09b46098ca8e39f3dfa6bed696be39bfe4395d

This commit appears in #14362 which was approved by pmusaraj. It was merged by jbrw.