Fixed typo in docstring for timed_mating/models.py
Fixed typo in docstring for timed_mating/models.py

BridgesLab/mousedb,davebridges/mousedb,BridgesLab/mousedb,davebridges/mousedb,BridgesLab/mousedb,davebridges/mousedb,davebridges/mousedb,BridgesLab/mousedb