docs : Update operationTrait.json

[SuryaPratap1008]

Description

OperationTrait.json has been successfully updated by mentioning the message inside the object description as being excluded

Related issue(s)
'Fixes #994'

[asyncapi-bot]

We require all PRs to follow Conventional Commits specification.
More details 👇🏼

 No release type found in pull request title "docs : Update operationTrait.json". Add a prefix to indicate what kind of release this pull request corresponds to. For reference, see https://www.conventionalcommits.org/

Available types:
 - feat: A new feature
 - fix: A bug fix
 - docs: Documentation only changes
 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
 - perf: A code change that improves performance
 - test: Adding missing tests or correcting existing tests
 - build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
 - ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
 - chore: Other changes that don't modify src or test files
 - revert: Reverts a previous commit

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[smoya]

Duplication of https://github.com/asyncapi/spec-json-schemas/pull/480/files