Docs: Adding Documentation README enhancing grammar

[alphaxek]

What is the improvement or update you wish to see?

Perfectly understandable grammar while reading adding-documentation README so that everything is clear to the reader in first glance

Is there any context that might help us understand?

Please go through the below adding-documentation README link

https://github.com/alpha-xek/next.js/blob/canary/contributing/docs/adding-documentation.md

Does the docs page already exist? Please link to it.

https://github.com/alpha-xek/next.js/blob/canary/contributing/docs/adding-documentation.md

[github-actions]

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