[1.6.x] Corrected indentation in docs to prevent inadvertent blockquote.

Backport of c2d8da7555e3fef30c43f3ffe2e8963ca1f9fdd5 from stable/1.7.x
[1.6.x] Removed need to update Python version support note on each new release.

Backport of 0c06f06131c613dc4173c83ea17c68c31835fc71 from master