[googlefonts.py] Fix a few typos (issue #1990)
[googlefonts.py] Fix a few typos (issue #1990)

fix typos: change "counters" to "contours"
moyogo/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,graphicore/fontbakery