Fixes a misplaced comment.

Fixes a misplaced comment from #785.

@pwendell

Author: Prashant Sharma <prashant.s@imaginea.com>

Closes #788 from ScrapCodes/patch-1 and squashes the following commits:

3ef6a69 [Prashant Sharma] Update package-info.java
67d9461 [Prashant Sharma] Update package-info.java

graphx/src/main/scala/org/apache/spark/graphx/lib/package-info.java

@@ -16,6 +16,6 @@
  */
 
 /**
- * Internal support for MLLib Python API.
+ * Various analytics functions for graphs.
  */
-package org.apache.spark.graphx.lib;
\ No newline at end of file
+package org.apache.spark.graphx.lib;