Fixes recomendation about RC limit in developer docs

What does this MR do?

Fixes docs about the ReactiveCaching limit.

The limit was at some point 1 Mb, but we've removed the limit because when we introduced the limit this limit was not enough for many usages of ReactiveCaching, thus breaking the user experience. So we've decided to disable the default limit until all the current usages of ReactiveCaching limit are fine tuned. Afterwards we can reactivate a default of 1MB.

Related issues

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