fix: description for disable rescheduling and cancelling

[pallava-joshi]

What does this PR do?

https://calendso.slack.com/archives/C08B8SYUY02/p1763725319936019

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Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Clarified the “Disable Rescheduling” and “Disable Cancelling” descriptions to show they apply to both guests and organizers when using calendar invites or email. Updated en/common.json copy to match current behavior.

^{Written for commit b324c2e. Summary will update automatically on new commits.}

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[cubic-dev-ai]

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