feat: add doc for multiline logs

[nityanandagohain]

Fixes https://github.com/SigNoz/engineering-pod/issues/1403

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Name	Status	Preview	Comments	Updated (UTC)
signoz-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2024 0:49am

[Calm-Rock]

Paritally solves this issue - https://github.com/SigNoz/signoz-web/issues/108