docs(api.md): fix nit

aslushnikov · aslushnikov · commit aa60a7cebd9d · 2020-02-12T16:18:05.000-08:00
diff --git a/docs/api.md b/docs/api.md
@@ -3372,7 +3372,7 @@ If the function passed to the `worker.evaluateHandle` returns a [Promise], then
 
 #### event: 'close'
 
-Emitted when the browser app closes.
+Emitted when the browser server closes.
 
 #### browserServer.close()
 - returns: <[Promise]>
