docs: provide reply definition

[Tenischev]

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title: "Provide more solid definition of the reply"

This PR adds definition of the reply message and fix a drift of naming response-reply in the spec.

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Related issue(s): Resolves: #980

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[Tenischev]

@derberg as requested 😄

[GreenRover]

Change makes sense for me.

[sonarqubecloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

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