Fix minor grammatical error Update MAINTAINERS.md

[mdqst]

Description:
I noticed a small grammatical issue in the "Maintainers" section of the documentation. The sentence:

"5 significant changes on code have been authored in this repos by the proposed maintainer and accepted (merged PRs)."

should be corrected to:

"5 significant changes to code have been authored in this repo by the proposed maintainer and accepted (merged PRs)."

Explanation:

• The phrase "changes to code" is the correct usage, as it indicates changes made to the code itself.

This correction ensures better clarity and grammatical accuracy in the documentation.

Thanks for sending a pull request! Have you done the following?

• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests

[macfarla]

Hey, thanks for your interest in this project, but we aren't accepting modifications to governance files from non-maintainers. If you’d like to contribute, we encourage you to tackle a programming task instead. There is a list of good first issues, take a look!