Tail fin aerodynamics: address changes requested in pull request #1874

[abhineet-gupta]

This pull request is NOT ready to be merged

Documentation have been updated and tail fin test have been updated

Feature or improvement description

• Address comments on PR Add unsteady aerodynamic model for turbine tail fin #1874 to modify the documentation and description of inputs in tail fin aerodyn file
• Changed the order of inputs in tail fin input file to better separation polar based and unsteady aerodynamics inputs

Impacted areas of the software
AeroDyn

Relevant tests

• Tailfin_FreeYaw1DOF_PolarBased
• Tailfin_FreeYaw1DOF_Unsteady
• SWRT_AeroDyn_TFin.dat in glue-codes/openfast/SWRT