chore: fix link in doc (#1606)

* chore: fix link in doc

b/208292008

* formatting

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google-http-client/src/main/java/com/google/api/client/http/HttpMediaType.java

@@ -26,8 +26,8 @@
 import java.util.regex.Pattern;
 
 /**
- * HTTP Media-type as specified in the HTTP RFC ( {@link
- * "http://tools.ietf.org/html/rfc2616#section-3.7"}).
+ * HTTP Media-type as specified in the <a
+ * href="https://datatracker.ietf.org/doc/html/rfc2616#section-3.7">HTTP RFC</a>.
  *
  * <p>Implementation is not thread-safe.
  *