chore(README): fix typo in capabilities query example

[alexrodfe]

Motivation and Context

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] I have created tests for my code changes, and the tests are passing.
• [ ] I have executed the pre-commit hooks locally.
• [ ] I have updated the documentation accordingly.
• [ ] The commit message follows our guidelines: https://github.com/konstellation-io/kdl-server/blob/main/CONTRIBUTING.md
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] My change requires a change to the documentation (create a new issue if the documentation has not been updated).

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information