Emphasize that there is no user-facing Otel Logs API (#3856)

Author: tigrannajaryan

content/en/docs/languages/java/instrumentation.md

@@ -1190,9 +1190,11 @@ meter
 
 ## Logs
 
-Logs are distinct from Metrics and Tracing in that there is no user-facing logs
-API. Instead, there is tooling to bridge logs from existing popular log
-frameworks (e.g. SLF4j, JUL, Logback, Log4j) into the OpenTelemetry ecosystem.
+Logs are distinct from metrics and traces in that **there is no user-facing
+OpenTelemetry logs API**. Instead, there is tooling to bridge logs from existing
+popular log frameworks (e.g. SLF4j, JUL, Logback, Log4j) into the OpenTelemetry
+ecosystem. For rationale behind this design decision, see
+[Logging specification](/docs/specs/otel/logs/).
 
 The two typical workflows discussed below each cater to different application
 requirements.