Updated some docs in numpy_fft.py
Updated some docs in numpy_fft.py

drwells/pyFFTW,hgomersall/pyFFTW,drwells/pyFFTW,simudream/pyFFTW,jonathanessen/pyFFTW,jonathanessen/pyFFTW,simudream/pyFFTW,simudream/pyFFTW,frederikhermans/pyfftw-arm,simudream/pyFFTW,drwells/pyFFTW,frederikhermans/pyfftw-arm,hgomersall/pyFFTW,drwells/pyFFTW,hgomersall/pyFFTW,jonathanessen/pyFFTW