Update schema.md (#24)

Line break for proper render. See <https://www.graphql-java.com/documentation/v12/schema#scalar>.

Author: atilacamurca

content/documentation/v12/schema.md

@@ -294,7 +294,8 @@ The GraphQL type system supports the following kind of types:
 ``graphql-java`` supports the following Scalars:
 
 
-Standard graphql scalars : 
+Standard graphql scalars:
+
 * ``GraphQLString``
 * ``GraphQLBoolean``
 * ``GraphQLInt``