Move custom loader discussion to better place

For #92. We already had a section to talk about YAML loading, so I made
a subsection there.

docs/index.rst

@@ -49,19 +49,6 @@ the key doesn’t exist in any configuration file, Confuse will raise a
 of ``confuse.ConfigError``) lets you painlessly validate the user’s
 configuration as you go.
 
-Confuse uses a custom loader based on pyyaml's SafeLoader with extra
-contructors for yaml tags.
-You can replace this Loader by a one of your own with an extra loader=
-parameter::
-
-    config = confuse.Configuration("name", loader=yaml.Loaded)
-
-You can even add yo your custom loader the confuse's loader feature
-by calling add_constructors::
-
-    loader = yaml.Loader
-    confuse.Loader.add_constructors(loader)
-    config = confuse.Configuration("name", loader=loader)
 
 View Theory
 -----------
@@ -320,6 +307,23 @@ To produce a YAML string reflecting a configuration, just call
 but it does play some tricks to preserve comments and spacing in the original
 file.
 
+Custom YAML Loaders
+'''''''''''''''''''
+
+Confuse uses a custom loader based on pyyaml's SafeLoader with extra
+contructors for yaml tags.
+You can replace this Loader by a one of your own with an extra loader=
+parameter::
+
+    config = confuse.Configuration("name", loader=yaml.Loaded)
+
+You can even add yo your custom loader the confuse's loader feature
+by calling add_constructors::
+
+    loader = yaml.Loader
+    confuse.Loader.add_constructors(loader)
+    config = confuse.Configuration("name", loader=loader)
+
 
 Configuring Large Programs
 --------------------------