DOC: Disclaimer for FFT library

Adds sentence to the top of routines.fft.html explaining that scipy.fft is a more comprehensive collection, per mailing list discussion (http://numpy-discussion.10968.n7.nabble.com/Add-Chebyshev-cosine-transforms-implemented-via-FFTs-td48373.html#a48382)
numpy · Aug 9, 2020 · 8a92eb4 · 8a92eb4
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commit 8a92eb4
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diff --git a/numpy/fft/__init__.py b/numpy/fft/__init__.py
@@ -4,6 +4,9 @@
 
 .. currentmodule:: numpy.fft
 
+The SciPy module `scipy.fft` is a more comprehensive superset
+of ``numpy.fft``, which includes only a basic set of routines.
+
 Standard FFTs
 -------------