Update documentation guide (#14673)

Author: jaydeluca

docs/contributing/documenting-instrumentation.md

@@ -220,8 +220,22 @@ within 24 hours.
 
 ## opentelemetry.io
 
-All of our instrumentation modules are listed on the opentelemetry.io website in the context of how
-to [suppress specific instrumentation](https://opentelemetry.io/docs/zero-code/java/agent/disable/#suppressing-specific-agent-instrumentation).
+All of our instrumentation modules are listed on the opentelemetry.io website in two places:
+
+### Supported Libraries
+
+The [Supported Libraries](https://opentelemetry.io/docs/zero-code/java/agent/supported-libraries/)
+page lists all the library instrumentations that are included in the OpenTelemetry Java agent. It
+mostly mirrors the information from the [supported libraries](../supported-libraries.md) page in
+this repo, and should be updated when adding or removing library instrumentations.
+
+This page may be automatically generated in the future, but for now it is manually maintained.
+
+### Suppressing Instrumentation
+
+The [Suppressing instrumentation](https://opentelemetry.io/docs/zero-code/java/agent/disable/#suppressing-specific-agent-instrumentation)
+page lists the instrumentations in the context of the keys needed for using
+the `otel.instrumentation.[name].enabled` configuration.
 
 All new instrumentations should be added to this list. There is a
 [Github action](../../.github/workflows/documentation-disable-list-audit.yml) that runs nightly to check