Merge branch 'nfriend-fix-graphql-feature-flag-example' into 'master'

Reverse condition in GraphQL feature flag docs

See merge request gitlab-org/gitlab!47838

doc/development/api_graphql_styleguide.md

@@ -397,7 +397,7 @@ field :foo, GraphQL::STRING_TYPE,
                    'if `my_feature_flag` feature flag is disabled'
 
 def foo
-  object.foo unless Feature.enabled?(:my_feature_flag, object)
+  object.foo if Feature.enabled?(:my_feature_flag, object)
 end
 ```