improve pallet hooks docs (#14578)

* improve pallet hooks docs

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Sam Johnson <[email protected]>

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Sam Johnson <[email protected]>

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Sam Johnson <[email protected]>

* fix mastekn removal

* Apply suggestions from code review

Co-authored-by: Juan <[email protected]>

* add diagram

* fix all links

* fix diagram

* improve diagram with some notes

* update

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Co-authored-by: Sam Johnson <[email protected]>
Co-authored-by: parity-processbot <>
Co-authored-by: Juan <[email protected]>