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

lib/autospec/simple_runner.rb

@@ -23,7 +23,7 @@ module Autospec
 
       command = begin
         line_specified = specs.split.any? { |s| s =~ /\:/ } # Parallel spec can't run specific line
-        multiple_files = specs.split.count > 1 || specs == "spec" # Only paralellize multiple files
+        multiple_files = specs.split.count > 1 || specs == "spec" # Only parallelize multiple files
         if ENV["PARALLEL_SPEC"] == '1' && multiple_files && !line_specified
           "bin/turbo_rspec #{args.join(" ")} #{specs.split.join(" ")}"
         else