Mention py3-lldb for SOS on Alpine Linux (#45470)

Author: am11

docs/core/diagnostics/lldb-linux.md

@@ -49,7 +49,7 @@ To install the LLDB packages:
 
 ```console
     apk update
-    apk add lldb
+    apk add lldb py3-lldb
 ```
 
 To launch LLDB: