Fix u_mass description
@@ -301,7 +301,7 @@ Available metrics
* **Coherence Metrics**:
- * `UMass Coherence`_ : :code:`Coherence({'measure':'c_umass'}`
+ * `UMass Coherence`_ : :code:`Coherence({'measure':'u_mass'}`
* `C_V Coherence`_ : :code:`Coherence({'measure':'c_v'}`
* `UCI Coherence`_ : :code:`Coherence({'measure':'c_uci'}`
* `NPMI Coherence`_ : :code:`Coherence({'measure':'c_npmi'}`
