Made docstrings more consistent with one another (like giving the same gti example, or referring to averaged power spectra vs AveragedPowerspectrum, and fixed pep8 issues.
Made docstrings more consistent with one another (like giving the same gti example, or referring to averaged power spectra vs AveragedPowerspectrum, and fixed pep8 issues.

StingraySoftware/stingray