Fix typos and enhance communication in README.md and Contributing.md

[Agnik7]

fix: Closes Issue #822

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Fixed the typos and improved the documentation quality in the README.md, CONTRIBUTING.md and the MIGRATION.md files. This has been done to ensure a better communication and a better reach.

Author: Agnik Bakshi.

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[Agnik7]

@atompie I have created the PR. Kindly review