Adding missing bracket in doc string

[AnHeuermann]

Issue

A closing bracket is missing in some documentation strings for some temperature coefficient in various models.

Changes

• Adding missing closing bracket in Temperature coefficient doc string in various locations.

  - "Temperature coefficient of resistance (R_actual = R*(1 + alpha*(T_heatPort - T_ref))"
  + "Temperature coefficient of resistance (R_actual = R*(1 + alpha*(T_heatPort - T_ref)))" 

• My IDE is set up to removes trailing white space. If needed I can refactor this PR to exclude these changes, but in my opinion it is cleaner to remove trailing while spaces anyway.

[AnHeuermann]

I think this is my first contribution to this modelica repository. I'm part of Santa Anna IT Research Institute, Sweden. We signed the MA CLA (https://github.com/modelica/fmi-design/blob/master/Members/Members.md).

[henrikt-ma]

• My IDE is set up to removes trailing white space. If needed I can refactor this PR to exclude these changes, but in my opinion it is cleaner to remove trailing while spaces anyway.

Yes, let's take the opportunity to get rid of some trailing white-space!