fixup! Document Ariadne's support for Descriptions [initial draft]
Descriptions
============
-Ariadne supports Descriptions via `GraphQL Schema Definition syntax <https://facebook.github.io/graphql/June2018/#sec-Descriptions>`_.
+Ariadne supports Descriptions via `GraphQL Schema Definition Language syntax <https://facebook.github.io/graphql/June2018/#sec-Descriptions>`_.
Declaration
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