Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit 7f7ac64e2847b7cbdb9274fae75fed981601e7d7.
Revert "[maven-release-plugin] prepare release v0.8.1-incubating"

This reverts commit e88e6369d9ac55dff75c230ed5bc96c995b1d620.
Minor documentation fixes