AK: Fix mention of renamed member in Utf16View

Author: https://github.com/gmta
Commit: 9a03ee1c24
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5574
Reviewed-by: https://github.com/trflynn89 ✅

AK/Utf16View.h

@@ -510,7 +510,7 @@ private:
     } m_string { .ascii = nullptr };
 
     // Just like Utf16StringData, we store whether this string has ASCII or UTF-16 storage by setting the most
-    // significant bit of m_code_unit_length for UTF-16 storage.
+    // significant bit of m_length_in_code_units for UTF-16 storage.
     size_t m_length_in_code_units { 0 };
     mutable size_t m_length_in_code_points { NumericLimits<size_t>::max() };
 };