Fix min/max mutator documentation links

[yoz]

No description provided.

[mattjohnsonpint]

Thanks, but actually the current docs are correct. The docs explain:

So a.max(b) is the same as a = moment.min(a, b) (note that max is converted to min).
...
So a.min(b) is the same as a = moment.max(a, b) (note that min is converted to max).

[mattjohnsonpint]

In other words, the old style was confusing, so they were reversed to their expected names in the new style.