dmi plugin sync openapi yml

- copy target/generated-sources/swagger/openapi.yaml → docs/api/swagger/openapi.yaml
- fixed the tox.ini for the documentation build issue
- updated description for topic paramter

Issue-ID: CPS-1276
Change-Id: I0771fd6b7a8fda5085a535e02cd40fa49e6b8b6f
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
3 files changed