docs: fix typo in IP_ADDRESS detection method description

[Coshea46]

Change Description

The documentation table incorrectly stated that the IP_ADDRESS entity detector validates a checksum. Checksums exist only at the packet level for IP addresses, which is not something a string-based entity recognizer can check. The IpRecognizer itself relies on regex pattern matching, context words, and structural validation via Python's ipaddress library; there's no checksum logic in it.

This PR removes the incorrect "and checksum" reference from docs/supported_entities.md and clarifies that detection relies on regex and context instead.

Describe your changes

• Updated docs/supported_entities.md to remove the incorrect "checksum" claim for the IP_ADDRESS entity detector
• Clarified that IpRecognizer relies on regex and context, not checksum validation

Issue reference

No tracked issue. Problem was found while reviewing the documentation.

Checklist

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• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required