[zx] Use camel-cased names for zx declarations

We are in the process of migrating the names to be declared as such.

Bug: 109734
Change-Id: I3efbe7b9bcccceb4499159c49012ce2999e1fda8
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/go/+/841836
Reviewed-by: Mitchell Kember <mkember@google.com>
Fuchsia-Auto-Submit: Joshua Seaton <joshuaseaton@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/src/syscall/zx/fidl/internal/bindingstest/test.test.fidl b/src/syscall/zx/fidl/internal/bindingstest/test.test.fidl
index ce19d10..1d01507 100644
--- a/src/syscall/zx/fidl/internal/bindingstest/test.test.fidl
+++ b/src/syscall/zx/fidl/internal/bindingstest/test.test.fidl
@@ -17,7 +17,7 @@
         foo string;
     });
     EchoHandleRights(resource struct {
-        h zx.handle:<PORT, zx.Rights.READ | zx.Rights.TRANSFER | zx.Rights.DUPLICATE>;
+        h zx.Handle:<PORT, zx.Rights.READ | zx.Rights.TRANSFER | zx.Rights.DUPLICATE>;
     }) -> (struct {
         rights uint32;
     });