Update Frequency and Time Domain documentation

[hagenw]

This includes two points:

• Update the documentation on local WFS as sound_field_mono_localwfs() is now deprecated.
• Repeat the structure of WFS, NFC-HOA, LWFS for the Time Domain

See: http://matlab.sfstoolbox.org/en/latest/frequency-domain/ http://matlab.sfstoolbox.org/en/latest/time-domain/