DEV: Correct typos and spelling mistakes (#12812)

Over the years we accrued many spelling mistakes in the code base. 

This PR attempts to fix spelling mistakes and typos in all areas of the code that are extremely safe to change 

- comments
- test descriptions
- other low risk areas

script/import_scripts/discuz_x.rb

@@ -158,7 +158,7 @@ class ImportScripts::DiscuzX < ImportScripts::Base
 
       break if results.size < 1
 
-      # TODO: breaks the scipt reported by some users
+      # TODO: breaks the script reported by some users
       # next if all_records_exist? :users, users.map {|u| u["id"].to_i}
 
       create_users(results, total: total_count, offset: offset) do |user|