Remove regression comments from new tests

Per PR review feedback.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Afonso Aguas

test/whatsapp/api/client_test.rb

@@ -51,11 +51,6 @@ def test_send_request_delete_with_success_response
         assert_nil(response_body)
       end
 
-      # Regression: a 200 response whose body text contains the substring "error" (e.g.
-      # inside a WhatsApp template body) must not be treated as an error. Previously the
-      # client passed the raw body String to `response_error?`, which delegated to
-      # `String#[]` — a substring scan — and raised HttpResponseError for any body
-      # containing the word "error".
       def test_send_request_does_not_raise_when_body_text_contains_error_substring
         payload = {
           'data' => [{

test/whatsapp/api/responses/generic_error_response_test.rb

@@ -19,10 +19,6 @@ def test_response_error_returns_nil_for_hash_without_error_key
           assert_nil(GenericErrorResponse.response_error?(response: response))
         end
 
-        # Regression guard: a raw JSON string that happens to contain the substring "error"
-        # (e.g. inside a template body) must NOT trigger an error. Previously String#[] was
-        # used as a substring scan, causing false positives for any 200 response body
-        # mentioning the word "error".
         def test_response_error_returns_false_for_string_input
           body = '{"data":[{"text":"si tu cupón te da algún error, avísanos"}]}'
           assert_equal(false, GenericErrorResponse.response_error?(response: body))