Default snippets take precedence over those that are explicitly configured #453
Description
When RestDocumentationGenerator combines the default snippets with those that are specific to the operation being documented, the defaults are added last. This means that if a snippet that is one of the defaults is also specifically configured for a particular operation, the default snippet will win. This makes it more difficult than it needs to be to use a customised variant of one of the default snippets in a single test as the defaults need to be change which affects every test that is using the same configuration.