2.1 Version of documentation? / CellTable sorting

We are currently at version 2.1 of GWT and I'm trying to implement
sorting of CellTables. The online (2.2) GWT documentation for doing
this isn't compatible with 2.1 (i.e. the 2.2 docs reference classes/
methods that aren't available in 2.1.

Is there documentation for 2.1 anywhere that I can reference /
download?

Any help much appreciated.

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