LiveIntent UserId module: Clean up the sub-module documentation (prebid#5011)

* update-li-sub-moduled-doc

* removed params.storage fro example config

* removed redundant sentence

* Review session changes

* Update liveintent.md

* clarity and code font update

* Editing session #2

* Remove brackets and italic

* Rewrite the section

* Clean-up

* Fix code examples

* updated code font and punctuations

* Minor improvements

* Clean-up

* Fix link

* Remove superflous commas

* Fix indent

* Improve indent pt2

* added punctuation

* fixed url

Co-authored-by: Wiem Zine El Abidine <[email protected]>

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Co-authored-by: Emmanuel Adebayo <[email protected]>
Co-authored-by: Wiem Zine El Abidine <[email protected]>

Author: 3 people