Fix TS example for recording exceptions

Author: Grunet

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

@@ -1085,7 +1085,9 @@ import opentelemetry, { SpanStatusCode } from '@opentelemetry/api';
 try {
   doWork();
 } catch (ex) {
-  span.recordException(ex);
+  if (ex instanceof Error) {
+    span.recordException(ex);
+  }
   span.setStatus({ code: SpanStatusCode.ERROR });
 }
 ```
@@ -1100,7 +1102,9 @@ const opentelemetry = require('@opentelemetry/api');
 try {
   doWork();
 } catch (ex) {
-  span.recordException(ex);
+  if (ex instanceof Error) {
+    span.recordException(ex);
+  }
   span.setStatus({ code: opentelemetry.SpanStatusCode.ERROR });
 }
 ```