fix typo

Co-authored-by: Dusty Greif <[email protected]>

Author: keithamus

lib/secure_headers/headers/content_security_policy.rb

@@ -150,7 +150,7 @@ def reject_all_values_if_none(source_list)
 
     def normalize_uri_paths(source_list)
       source_list.map do |source|
-        # Normalize domains ending in a single / as without omitting the slash accomplisheg the same.
+        # Normalize domains ending in a single / as without omitting the slash accomplishes the same.
         # https://www.w3.org/TR/CSP3/#match-paths § 6.6.2.10 Step 2
         begin
           uri = URI(source)