Update hooks.md

Author: maurei

docs/usage/resources/hooks.md

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-@milosloub  @wisepotato.
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-New hooks API is pretty much finished. Below is the usage guide, can also be found in the docs.  Time for a re-review.
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-Let us focus first on the discussion of the usage / hooks API / backward compatiblity related stuff. 
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-As soon as we're totally aligned with respect to this, we can quibble about internals: at this point any changes internally should not affect the interfaces/hooks API, therefore shouldn't be breaking
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 # Resource Hooks
 This section covers the usage of **Resource Hooks**, which is a feature of`ResourceDefinition<T>`. See the [ResourceDefinition usage guide](resource-definitions.md) for a general explanation on how to set up a `ResourceDefinition<T>`.