Branch fix tooltip help issue

Created by: satabol

Hello.

I'm beginner user of sverchok. I really like it. I read many nodes documentation and found some issues (I think about all nodes):

1. Several nodes link to other documentation. Ex. "Solid/Volume (Solid)" link to "Analyzers/Volume".
2. Some nodes and their docs has different headers.
3. Some errata.

Solution description

1. I change some nodes names to capital letters like docs or docs like nodes names. (Except Nodes in Viz)
2. I change code to select correct documentation collection.

Is it to be helpfully?

If you decide to merge my changes - please check it. )))