Update a comment in proto_library.gni
The code for perfetto_proto_library template has "cpp" as one of the
elements of default value. This CL fixes a comment to reflect that.
Change-Id: I834720507a82b10e5508fea85ebe0328031c7ace
diff --git a/gn/proto_library.gni b/gn/proto_library.gni
index d92c669..ca5370b 100644
--- a/gn/proto_library.gni
+++ b/gn/proto_library.gni
@@ -27,7 +27,7 @@
#
# For instance:
# perfetto_proto_library("xxx_@TYPE@") {
-# proto_generators = [ "lite", "zero" ] # lite+zero is the default value.
+# proto_generators = [ "lite", "zero" ] # lite+zero+cpp is the default value.
# sources = [ "one.proto", "two.proto" ]
# deps = [ "dep:@TYPE@" ]
# }
