mk/cargo-binary.mk: Add usage example.

[ng0 <ng0%NetBSD.org@localhost>]

Module Name:	pkgsrc-wip
Committed By:	ng0 <ng0%NetBSD.org@localhost>
Pushed By:	ng0
Date:		Wed Aug 21 10:21:10 2019 +0000
Changeset:	43b7bfdedc1a7b017947b8e6f7841aa8c6eed454

Modified Files:
	mk/cargo-binary.mk

Log Message:
mk/cargo-binary.mk: Add usage example.

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=43b7bfdedc1a7b017947b8e6f7841aa8c6eed454

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 mk/cargo-binary.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diffs:
diff --git a/mk/cargo-binary.mk b/mk/cargo-binary.mk
index 72c9abdab4..17ce80b002 100644
--- a/mk/cargo-binary.mk
+++ b/mk/cargo-binary.mk
@@ -3,7 +3,7 @@
 # Common logic that can be used by packages that build rust binaries.
 #
 # Usage example:
-# TODO
+# See wip/rust-bindgen
 #
 #
 # TODO: