[Analytics] Clarify WebSocket session duration reporting

[mbullock1986]

Summary

Clarifies that the WebSocket reporting fix restores both full-session data transfer and full-session duration reporting. The original changelog described corrected byte accounting but did not explicitly state that reported duration now covers the complete WebSocket session rather than only the initial handshake.

Related: ESCALATION-6311

Documentation checklist

• This PR updates an existing changelog entry.
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

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[mbullock1986]

/full-review