Add semantic conventions column to supported libraries doc (open-telemetry#6974)

Related to open-telemetry#6735.

Want to get buy in on the approach before going further.

Author: jack-berg

README.md

@@ -54,7 +54,8 @@ data from a Java application without code changes.
 
 This repository also publishes standalone instrumentation for several libraries (and growing)
 that can be used if you prefer that over using the Java agent.
-Please see [standalone library instrumentation](docs/standalone-library-instrumentation.md)
+Please see the standalone library instrumentation column
+on [Supported Libraries](docs/supported-libraries.md#libraries--frameworks).
 if you are looking for documentation on using those.
 
 ## Getting Started