Add a note that the rgbimg module is only built on 32-bit machines (prompted by a question to webmaster). Re-wrapped a long line.
Add a note that the rgbimg module is only built on 32-bit machines (prompted
by a question to webmaster).
Re-wrapped a long line.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator