LibURL+LibWeb+Tests: Remove redundant words

Author: https://github.com/zoupingshi 🔰
Commit: b609d8481a
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3503
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/Psychpsyo

Libraries/LibURL/Parser.cpp

@@ -875,7 +875,7 @@ Optional<URL> Parser::basic_parse(StringView raw_input, Optional<URL const&> bas
                 }
                 // 6. Otherwise, if url is special, base is non-null, and base’s scheme is url’s scheme:
                 else if (url->is_special() && base_url.has_value() && base_url->scheme() == url->m_data->scheme) {
-                    // 1. Assert: base is is special (and therefore does not have an opaque path).
+                    // 1. Assert: base is special (and therefore does not have an opaque path).
                     VERIFY(base_url->is_special());
 
                     // 2. Set state to special relative or authority state.