Fix docs compile bug after function rename

Author: lukelbd

docs/conf.py

@@ -216,8 +216,8 @@
 
 # Create sample .proplotrc file
 from proplot.config import rc
-rc._save_proplotrc(os.path.join('_static', 'proplotrc'))
 rc._save_rst(os.path.join('_static', 'rctable.rst'))
+rc._save_yaml(os.path.join('_static', 'proplotrc'))
 
 # Role
 # default family is py, but can also set default role so don't need