Update the value used for the development stability status

Co-authored-by: Antoine Toulme <antoine@toulme.name>

cmd/mdatagen/metadata-schema.yaml

@@ -6,7 +6,7 @@ status:
   # Required: The class of the component (For example receiver)
   class: <receiver|processor|exporter|connector|extension>
   # Required: The stability of the component - See https://github.com/open-telemetry/opentelemetry-collector#stability-levels
-  stability: <in development|alpha|beta|stable|deprecated|unmaintained>
+  stability: <development|alpha|beta|stable|deprecated|unmaintained>
   # Optional: The distributions that this component is bundled with (For example core or contrib)
   distributions: []string
   # Optional: A list of warnings that should be brought to the attention of developers looking to use this component