DOC Correct linking of TruncatedSVD (scikit-learn#7749)

Author: raghavrv

sklearn/decomposition/pca.py

@@ -118,7 +118,7 @@ class PCA(_BasePCA):
  truncated SVD.
 
  Notice that this class does not support sparse input. See
- :ref:`<TruncatedSVD>` for an alternative with sparse data.
+ :class:`TruncatedSVD` for an alternative with sparse data.
 
  Read more in the :ref:`User Guide <PCA>`.