Fix JSON context indents and line spacing.

Author: davidlehn

contexts/credentials/v2

@@ -154,6 +154,7 @@
 
         "id": "@id",
         "type": "@type",
+
         "holder": {
           "@id": "https://www.w3.org/2018/credentials#holder",
           "@type": "@id"
@@ -187,8 +188,8 @@
         "type": "@type",
 
         "jsonSchema": {
-           "@id": "https://www.w3.org/2018/credentials#jsonSchema",
-           "@type": "@json"
+          "@id": "https://w3.org/2018/credentials#jsonSchema",
+          "@type": "@json"
         }
       }
     },