Minor typo in docs/basics-of-parameter-estimation.txt

At line 8-9,

Firstly, consider a situation where you have discrete data :math:`\{y_0,
y_1,\ldots, y_n\}` taken at a set of times :math:`\{t_0, t_1, \ldots, y_n\}`.

should be

Firstly, consider a situation where you have discrete data :math:`\{y_0,
y_1,\ldots, y_n\}` taken at a set of times :math:`\{t_0, t_1, \ldots, t_n\}`.

Specifically, the last time coordinate should be t_n instead of y_n.