update read me file for Variable, vault, vaultGraphQl, version, webApi modules

[chiranjeevi-cj]

Description (*)

Update README.md file:

• Magento_Variable
• Magento_Vault
• Magento_VaultGraphQl
• Magento_Version
• Magento_Webapi

Fixed Issues (if relevant)

1. magento/devdocs README content for modules - work in M2 Code devdocs#4451: README content for modules - work in M2 Code

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @chiranjeevi-cj. Thank you for your contribution
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[chiranjeevi-cj]

@magento run all tests

[dobooth]

Change all these "Please find here..." to "Refer to [...) for more information."

[keharper]

A few more editorial comments.

[keharper]

Suggested change

	The Magento_VaultGraphQl is dependent on the following modules:
	The Magento_Webapi module is dependent on the following modules:

[keharper]

Suggested change

	The Magento_Version module allows to get Magento version and edition by HTTP GET request.
	The Magento_Version module allows retrieval of the Magento version and edition using HTTP GET requests.

[keharper]

This shouldn't be the first line. I'm not sure you need it at all, considering the contents of the Installation details section.

[keharper]

Suggested change

	The Magento_Variable module allows the creation of custom variables for use in email templates or in the WYSIWYG editor when editing descriptions of system entities.
	The Magento_Variable module allows you to create custom variables for use in email templates or in the WYSIWYG editor when editing descriptions of system entities.