Update schema links from 04 to 06

Author: mdboom

source/reference/schema.rst

@@ -21,36 +21,12 @@ Advanced
 --------
 
 If you need to declare that your schema was written against a specific
-version of the JSON Schema standard, and not just the latest version,
-you can use one of these predefined values:
-
-- ``http://json-schema.org/schema#``
-
-  JSON Schema written against the current version of the
-  specification.
-
-- ``http://json-schema.org/hyper-schema#``
-
-  JSON Schema hyperschema written against the current version of the
-  specification.
+version of the JSON Schema standard, you can include the draft name in the path, for example:
 
+- ``http://json-schema.org/draft-06/schema#``
 - ``http://json-schema.org/draft-04/schema#``
 
-  JSON Schema written against this version.
-
-- ``http://json-schema.org/draft-04/hyper-schema#``
-
-  JSON Schema hyperschema written against this version.
-
-- ``http://json-schema.org/draft-03/schema#``
-
-  JSON Schema written against JSON Schema, draft v3
-
-- ``http://json-schema.org/draft-03/hyper-schema#``
-
-  JSON Schema hyperschema written against JSON Schema, draft v3
-
 Additionally, if you have extended the JSON Schema language to include
 your own custom keywords for validating values, you can use a custom
 URI for ``$schema``.  It must not be one of the predefined values
-above.
+above, and should probably include a domain name you own.

source/structuring.rst

@@ -104,7 +104,7 @@ schema for a customer:
 .. schema_example::
 
     {
-      "$schema": "http://json-schema.org/draft-04/schema#",
+      "$schema": "http://json-schema.org/draft-06/schema#",
 
       "definitions": {
         "address": {
@@ -220,7 +220,7 @@ Tying this all together,
 .. schema_example::
 
     {
-      "$schema": "http://json-schema.org/draft-04/schema#",
+      "$schema": "http://json-schema.org/draft-06/schema#",
 
       "definitions": {
         "address": {