Update Thermostat.md

[KDMcMullan]

Grammar corrections to clarify "bypass". Other simplifications.
Corrected default timeresetset value to match the suggested user_config_override.h.

[KDMcMullan]

Just for clarity, the sentence "If the application requires to follow the command of the input once active (see bypass setup explained in previous section)." was the one I was targeting, but I did a couple of others, too. Have I done too much for a single change?
Grasping "bypass" and the polarity of cmnd/Tasmota_Name/INPUTSWITCHUSE were the things I struggled with most when exploring thermostat.

[blakadder]

care to check the accuracy of these additions @arijav

[mendel5]

I think this is a useful change and would appreciate it if somebody could merge this pull request.

However, we need to consider the merge conflict that is caused by this change: #1295 Replace "f.e." with "e.g.,", see also https://github.com/tasmota/docs/commits/master/docs/Thermostat.md
So we just need to make sure to keep the e.g..

[mendel5]

Thank you!