Fix paragraphing in GraphQL API docs

A new paragraph was added in
https://gitlab.com/gitlab-org/gitlab/commit/81c18638b73706394e8b6cb7be8f188a8de62d3a#b092f9968648954f57218eb92d028909b2bc795a
however due to the paragraph being outdented, it appears in the docs
without a paragraph.

doc/api/graphql/reference/index.md

@@ -9,6 +9,7 @@
 This documentation is self-generated based on GitLab current GraphQL schema.
 
 The API can be explored interactively using the [GraphiQL IDE](../index.md#graphiql).
+
 Each table below documents a GraphQL type. Types match loosely to models, but not all
 fields and methods on a model are available via GraphQL.
 

lib/gitlab/graphql/docs/templates/default.md.haml

@@ -9,8 +9,8 @@
 
   The API can be explored interactively using the [GraphiQL IDE](../index.md#graphiql).
 
-Each table below documents a GraphQL type. Types match loosely to models, but not all
-fields and methods on a model are available via GraphQL.
+  Each table below documents a GraphQL type. Types match loosely to models, but not all
+  fields and methods on a model are available via GraphQL.
 \
 - objects.each do |type|
   - unless type[:fields].empty?