feat: fix contributing doc

CONTRIBUTING.md

@@ -96,26 +96,6 @@ patterns in the spec.
 For a deeper discussion, see
 [this](/~https://github.com/open-telemetry/opentelemetry-specification/issues/165).
 
-## Documentation
-
-Each non-example Go Module should have its own `README.md` containing:
-
-- A pkg.go.dev badge which can be generated [here](https://pkg.go.dev/badge/).
-- Brief description.
-- Installation instructions (and requirements if applicable).
-- Hyperlink to an example. Depending on the component the example can be:
-    - An `example_test.go` like [here](exporters/stdout/stdouttrace/example_test.go).
-    - A sample Go application with its own `README.md`, like [here](example/zipkin).
-- Additional documentation sections such us:
-    - Configuration,
-    - Contributing,
-    - References.
-
-[Here](exporters/jaeger/README.md) is an example of a concise `README.md`.
-
-Moreover, it should be possible to navigate to any `README.md` from the
-root `README.md`.
-
 ## Style Guide
 
 One of the primary goals of this project is that it is actually used by