Update web documentation

Change-Id: I4b948e29fe18bfc3e062dac8f248d7df21f322cb
Fix ParaViewWeb python doc

Change-Id: I75871b32a0716d011ee92738ef456000ce470f43
Merge topic 'pvweb-update-docs' into next

b6e9323 Fix ParaViewWeb python doc
49e5b4a Update web documentation