feat: Clarify the exclusion field title

[girishpanchal30]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Make the field title clearer.

Closes https://github.com/Codeinwp/optimole-service/issues/1408

How to test the changes in this Pull Request:

Optimole > settings > Advanced -> Exclusions

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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