Description of "version" of "TextDocumentItem" is unclear

[RainerKlute]

The version field of TextDocumentItem is described as follows:

The version number of this document (it will strictly increase after each change, including undo/redo).

It is unclear what strictly increase means.

• If it means that the subsequent version number could be any number that is greater than the previous one, then the word strictly can and should be omitted.
• If an increment of the version number by exactly one is meant, the description should say so, e.g.:

The version number of this document. Each change, including undo/redo, increments it by one.

[dbaeumer]

I removed the strictly since we don't want to state that the increment is always one. A client could for optimization not sync all document state over to a server.