Fix missing \tt format for filename `nsfg.py`

AllenDowney / ThinkStats2

Text and supporting code for Think Stats, 2nd Edition

http://allendowney.github.io/ThinkStats2/

GNU General Public License v3.0

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Closed tartansandal closed 5 years ago

tartansandal commented 5 years ago

This was missing in one early paragraph. Elswhere it is formated with \tt.

AllenDowney commented 5 years ago

Thanks!