Update Postman docs link in explore-sidecar-endpoints.md

[Imod7]

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Description

Update Postman Collection link so that it includes the full docs (path params, query params, etc) in all the endpoints.

• Previous Postman Documentation has no info on each endpoint. Example : Account Asset Approvals
• New Postman Link includes all the necessary info and are aligned and up to date with the OpenAPI docs of Sidecar. Example : Account Asset Approvals

Related Sidecar Issue

https://github.com/paritytech/substrate-api-sidecar/issues/1440

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