Merge topic 'documentation'

a96d29eb Don't crash if no TransferFunction is set
2775806c vtkPoints::Resize may shrink and throw
6d9053fd vtkRenderWindow::SetMultiSamples / GL_MAX_SAMPLES
a0c6a6fc Fix typo
47c85475 Fix example DumpXMLFile.cxx
ddce737b vtkColorTransferFunction doesn't support alpha
74531fe5 Add missing . between 2 sentences
2fdb9c3e Improve doc of vtkColorTransferFunction::SetRange
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11434