Fix Documentation Errors

[tbirdso]

Several examples visibly note errors in migration, running, or output data. It would be good to address these on a case-by-case basis.

• https://examples.itk.org/src/segmentation/connectedcomponents/labelconnectcomponentsinbinaryimage/documentation
• https://examples.itk.org/src/filtering/imagestatistics/computeminmaxvariancemeanofimage/documentation
• https://examples.itk.org/src/filtering/imagefeature/sharpenimage/documentation
• https://examples.itk.org/src/filtering/imagefeature/findzerocrossingsinsignedimage/documentation
• https://examples.itk.org/src/filtering/imagefeature/findzerocrossingsinsignedimage/documentation
• https://examples.itk.org/src/filtering/convolution/normalizedcorrelation/documentation
• https://examples.itk.org/src/filtering/convolution/colornormalizedcorrelation/documentation
• https://examples.itk.org/src/core/common/neighborhooditeratoronvectorimage/documentation

[tbirdso]

Several examples are also commented out in CMakeLists.txt so that they are not built. These should be revisited and repaired.

https://github.com/InsightSoftwareConsortium/ITKSphinxExamples/blob/master/src/Segmentation/Classifiers/CMakeLists.txt