Update zero-code.md

Change the sentence: "This means that requests and responses, database calls, message queue calls, and so forth are what are instrumented" to "This means that requests and responses, database calls, message queue calls, and so forth are instrumented" (ie remove the "what are")

content/en/docs/concepts/instrumentation/zero-code.md

@@ -21,7 +21,7 @@ your application.
 
 Typically, zero-code instrumentation adds instrumentation for the libraries
 you're using. This means that requests and responses, database calls, message
-queue calls, and so forth are what are instrumented. Your application's code,
+queue calls, and so forth are instrumented. Your application's code,
 however, is not typically instrumented. To instrument your code, you'll need to
 use [code-based instrumentation](/docs/concepts/instrumentation/code-based).