[1.7.x] Fixed #23982 -- Added doc note on generating Python 2/3 cross-compatible migrations.
[1.7.x] Fixed #23982 -- Added doc note on generating Python 2/3 cross-compatible migrations.

Thanks Luke Plant for the report, and Tim Graham, Simon Charette, and Markus
Holtermann for review and discussion.

This is a backport of d4bdddeefe35214f194cb85e40dbb761c206e7fa from master.

oscaro/django,oscaro/django,oscaro/django,jyotsna1820/django,jyotsna1820/django,jyotsna1820/django,jyotsna1820/django,oscaro/django