updated docs

docs/docs/ml.xml

@@ -118,7 +118,7 @@ Davis E. King. <a href="http://www.jmlr.org/papers/volume10/king09a/king09a.pdf"
          <item>structural_graph_labeling_trainer</item> 
       </section>
       <section>
-         <name>Unsupervised - Clustering</name>
+         <name>Clustering</name>
          <item>pick_initial_centers</item> 
          <item>kkmeans</item>
          <item>find_clusters_using_kmeans</item> 
@@ -127,7 +127,7 @@ Davis E. King. <a href="http://www.jmlr.org/papers/volume10/king09a/king09a.pdf"
          <item>modularity</item> 
       </section>
       <section>
-         <name>Unsupervised - Miscellaneous</name>
+         <name>Unsupervised</name>
          <item>kcentroid</item>
          <item>linearly_independent_subset_finder</item>
          <item>empirical_kernel_map</item>