docs: update namespace ToCs

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---

Author: kgryte

lib/node_modules/@stdlib/fft/README.md

@@ -43,6 +43,8 @@ var o = ns;
 
 <div class="namespace-toc">
 
+-   <span class="signature">[`base`][@stdlib/fft/base]</span><span class="delimiter">: </span><span class="description">base routines for fast Fourier transforms.</span>
+
 </div>
 
 <!-- </toc> -->
@@ -84,6 +86,8 @@ console.log( objectKeys( ns ) );
 
 <!-- <toc-links> -->
 
+[@stdlib/fft/base]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/fft/base
+
 <!-- </toc-links> -->
 
 </section>

lib/node_modules/@stdlib/fft/base/README.md

@@ -43,6 +43,8 @@ var o = ns;
 
 <div class="namespace-toc">
 
+-   <span class="signature">[`fftpack`][@stdlib/fft/base/fftpack]</span><span class="delimiter">: </span><span class="description">FFTPACK routines for fast Fourier transforms.</span>
+
 </div>
 
 <!-- </toc> -->
@@ -84,6 +86,8 @@ console.log( objectKeys( ns ) );
 
 <!-- <toc-links> -->
 
+[@stdlib/fft/base/fftpack]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/fft/base/fftpack
+
 <!-- </toc-links> -->
 
 </section>

lib/node_modules/@stdlib/fft/base/fftpack/README.md

@@ -43,6 +43,9 @@ var o = ns;
 
 <div class="namespace-toc">
 
+-   <span class="signature">[`decompose( N, M, initial, si, oi, out, so, oo )`][@stdlib/fft/base/fftpack/decompose]</span><span class="delimiter">: </span><span class="description">factorize a sequence length into a product of integers.</span>
+-   <span class="signature">[`rffti( N, workspace, strideW, offsetW )`][@stdlib/fft/base/fftpack/rffti]</span><span class="delimiter">: </span><span class="description">initialize a workspace array for performing a real-valued Fourier transform.</span>
+
 </div>
 
 <!-- </toc> -->
@@ -84,6 +87,10 @@ console.log( objectKeys( ns ) );
 
 <!-- <toc-links> -->
 
+[@stdlib/fft/base/fftpack/decompose]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/fft/base/fftpack/decompose
+
+[@stdlib/fft/base/fftpack/rffti]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/fft/base/fftpack/rffti
+
 <!-- </toc-links> -->
 
 </section>