Added XML full form and descriptive link

[abrarpathan19]

Description

Added XML full form and descriptive link

Related Issue

Closes #ISSUE_NUMBER.

Verification Steps

https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/bk-frontend-dev-guide.html
https://magento.github.io/glossary/?#8c0645c5-aa6b-4a52-8266-5659a8b9d079

How Have YOU Tested this?

https://magento-research.github.io/pwa-studio/technologies/theme-vs-storefront/

Screenshots / Screen Captures (if appropriate):

http://prntscr.com/naynzz

Proposed Labels for Change Type/Package

• major (e.g x.0.0 - a breaking change)
• minor (e.g 0.x.0 - a backwards compatible addition)
• patch (e.g 0.0.x - a bug fix)

Checklist:

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

[magento-cicd2]

All committers have signed the CLA.

[vercel]

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[vercel]

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[vercel]

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[vercel]

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[jimbo]

Thanks for your contribution! 👍

Please make sure to review and sign the CLA so we can merge your pull request.

[abrarpathan19]

@jimbo,
I have sign CLA, please merge my PR

[coveralls]

Coverage remained the same at 76.914% when pulling 92f418a on abrarpathan19:patch-2 into 9def080 on magento-research:master.

[jimbo]

@abrarpathan19 In the future, please make sure to open PRs against the develop branch, rather than master. Unfortunately, I've already merged it, so I'll figure out how to revert and get it into develop from here.