Add link to Pandas-GBQ 0.5.0 in what's new.

Author: tswast

doc/source/whatsnew/v0.24.0.txt

@@ -20,7 +20,9 @@ Other Enhancements
 - :meth:`Index.droplevel` is now implemented also for flat indexes, for compatibility with :class:`MultiIndex` (:issue:`21115`)
 - Added support for reading from Google Cloud Storage via the ``gcsfs`` library (:issue:`19454`)
 - :func:`to_gbq` and :func:`read_gbq` signature and documentation updated to
-  reflect changes from the `Pandas-GBQ library version 0.5.0 <https://pandas-gbq.readthedocs.io/en/latest/changelog.html#changelog-0.5.0>`__. (:issue:`21627`)
+  reflect changes from the `Pandas-GBQ library version 0.5.0
+  <https://pandas-gbq.readthedocs.io/en/latest/changelog.html#changelog-0-5-0>`__.
+  (:issue:`21627`)
 
 
 .. _whatsnew_0240.api_breaking: