chore: update shouldCloseOnOverlayClick doc

[jamesbechet]

Changes proposed:

• updated documentation of the shouldCloseOnOverlayClick prop

Upgrade Path (for changed or removed APIs):

Acceptance Checklist:

• The commit message follows the guidelines in CONTRIBUTING.md.
• Documentation (README.md) and examples have been updated as needed.
• If this is a code change, a spec testing the functionality has been added.
• If the commit message has [changed] or [removed], there is an upgrade path above.

[doeg]

Thanks @jamesbechet!

@diasbruno a straightforward docs update for ya. :) Not sure if it needs a rebase to pick up the test fixes before merge.

[diasbruno]

Thanks, @jamesbechet for the PR. 🎉