Improve documentation for `fast-unstake` pallet (#14101)

* improve documentation of fast-unstake pallet

* using Sam's crate now

* fix

* remove stuff not needed

* Some updates

* use new prelude.

* update

* some other fancy docs

* Update frame/fast-unstake/src/lib.rs

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>

* Update frame/support/procedural/src/pallet/expand/mod.rs

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>

* update

* Update frame/fast-unstake/src/lib.rs

Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>

* update

* fix no_std issue by updating to latest version of docify

* get things compiling by adding a use for StakingInterface

* fix docify paths to their proper values, still not working because bug

* embed working 



* update syn

* upgrade to docify v0.1.10 for some fixes

* Apply suggestions from code review

Co-authored-by: Juan <juangirini@gmail.com>
Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>

* improve docs

* Update frame/support/procedural/src/pallet/expand/doc_only.rs

Co-authored-by: Juan <juangirini@gmail.com>

* fmt

* fix

* Update frame/support/procedural/src/pallet/expand/doc_only.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Update frame/support/procedural/src/pallet/expand/config.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* Update frame/support/procedural/src/pallet/expand/config.rs

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>

* remove redundant

* update docify rev

* update.

* update.

* update lock file

---------

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: Keith Yeung <kungfukeith11@gmail.com>
Co-authored-by: Sam Johnson <sam@durosoft.com>
Co-authored-by: Juan <juangirini@gmail.com>
Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com>
Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>
Co-authored-by: parity-processbot <>