minesweeper: small additional edit to example.py to replace *r* with word *row* instead.
minesweeper: small additional edit to example.py to replace *r* with word *row* instead.

exercism/xpython,jmluy/xpython,exercism/xpython,jmluy/xpython,exercism/python,behrtam/xpython,smalley/python,smalley/python,behrtam/xpython,exercism/python