fix documentation of solve methods

install R on azure

Prepare release 2.0.12.0-20230210

Prepare release v2.0.11.0-20220823

Prepare release v2.0.7.0-20211206

Bump version number in the documentation

Prepare release v2.0.5.0-280521

Prepare release v2.0.4.0-230121

Prepare release v2.0.3.0-151220

Prepare release v2.0.1.0-090819