Fix leeway value in usage documentation

[Matthew1471]

Fix inconsistent leeway example values.

The example states

you can set a leeway of 10 seconds

..and then goes on to set leeway=5 and implies that's also the same as setting a leeway datetime.timedelta of 10 seconds.

This change standarises on 5 seconds (although we equally could have standarised on 10 seconds).

[Copilot]

Pull request overview

This PR fixes an inconsistency in the PyJWT documentation where the text description mentioned setting a leeway of "10 seconds" but the actual code examples used a value of 5 seconds. The changes standardize all references to use 5 seconds consistently.

Key Changes:

• Updated the prose description to mention "5 seconds" instead of "10 seconds" to match the code examples
• Updated the datetime.timedelta example to use seconds=5 instead of seconds=10 for consistency

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