fix(docs): change parentNode option name in api example

doc/examples/api.html

@@ -11,7 +11,7 @@
                 roomName: "JitsiMeetAPIExample",
                 width: 700,
                 height: 180,
-                parent: undefined,
+                parentNode: undefined,
                 configOverwrite: {},
                 interfaceConfigOverwrite: {
                     filmStripOnly: true