#1151 missing JavaDoc for SpanningTree in stable 'core' module

[Egon Willighagen]

Reported by Nightly:

1 org.openscience.cdk.graph.SpanningTree 71 No documentation given for the method isDisconnected().
1 org.openscience.cdk.graph.SpanningTree 163 No documentation given for the method getSpanningTree().
1 org.openscience.cdk.graph.SpanningTree 172 No documentation given for the method getPath().
1 org.openscience.cdk.graph.SpanningTree 198 No documentation given for the method getBasicRings().
1 org.openscience.cdk.graph.SpanningTree 273 No documentation given for the method getAllRings().
1 org.openscience.cdk.graph.SpanningTree 294 No documentation given for the method getSpanningTreeSize().
1 org.openscience.cdk.graph.SpanningTree 326 No documentation given for the method getBondsAcyclicCount().
1 org.openscience.cdk.graph.SpanningTree 335 No documentation given for the method getBondsCyclicCount().