add yshade func to API list

TomDonoghue · TomDonoghue · commit 2ec52b1f9ec9 · 2021-04-12T00:23:50.000-04:00
diff --git a/doc/api.rst b/doc/api.rst
@@ -259,6 +259,7 @@ Plots for plotting power spectra with shaded regions.
 
     plot_spectrum_shading
     plot_spectra_shading
+    plot_spectra_yshade
 
 Plot Model Properties & Parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
