[docs] Add status header for carbon exporter (open-telemetry#10309)

Add status header for carbon

Author: Frapschen

exporter/carbonexporter/README.md

@@ -1,11 +1,15 @@
 # Carbon Exporter
 
+| Status                   |           |
+| ------------------------ |-----------|
+| Stability                | [beta]    |
+| Supported pipeline types | metrics   |
+| Distributions            | [contrib] |
+
 The [Carbon](https://github.com/graphite-project/carbon) exporter supports
 Carbon's [plaintext
 protocol](https://graphite.readthedocs.io/en/stable/feeding-carbon.html#the-plaintext-protocol).
 
-Supported pipeline types: metrics
-
 ## Configuration
 
 The following settings are required:
@@ -33,3 +37,6 @@ exporters:
 
 The full list of settings exposed for this receiver are documented [here](./config.go)
 with detailed sample configurations [here](./testdata/config.yaml).
+
+[beta]:https://github.com/open-telemetry/opentelemetry-collector#beta
+[contrib]:https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib