Cleanup: make class doc-strings directly above classes

In some cases it wasn't clear if a comment before a class was meant
to be it's doc-string. Remove blank lines between the class & it's
doc-string.

intern/iksolver/intern/IK_QSegment.h

@@ -32,7 +32,6 @@
  * The ordering of these transformations is vital, you must
  * use exactly the same transformations when displaying the segments
  */
-
 class IK_QSegment {
  public:
   EIGEN_MAKE_ALIGNED_OPERATOR_NEW