* Remove unused ThreadLocal from RedisStoreMSource
The `RedisStoreMessageSource` relies on an `IntegrationResourceHolder`
for a while already.
Its internal `ThreadLocal` is just out of use.
* Remove that `resourceHolder` property and related methods to interact with it.
* Mention the `IntegrationResourceHolder` and `store` attribute in the `redis.adoc`
* Fix language in Docs
Co-authored-by: Gary Russell <grussell@vmware.com>
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Co-authored-by: Gary Russell <grussell@vmware.com>
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