mk/git-package.mk: fix example in documentation

[Roland Illig <rillig%NetBSD.org@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Roland Illig <rillig%NetBSD.org@localhost>
Pushed By:	rillig
Date:		Sun Jan 28 13:48:40 2018 +0000
Changeset:	6b0ba0856b80c9f2df9dc3f866a4bcaf5bf1dcb6

Modified Files:
	mk/git-package.mk

Log Message:
mk/git-package.mk: fix example in documentation

The Git ID 4b825dc642 is not a commit but a tree object. Instead of
that, use the very first pkgsrc-wip commit ID as an example.

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=6b0ba0856b80c9f2df9dc3f866a4bcaf5bf1dcb6

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

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

diffs:
diff --git a/mk/git-package.mk b/mk/git-package.mk
index bcb71897e9..15ceb1d95f 100644
--- a/mk/git-package.mk
+++ b/mk/git-package.mk
@@ -29,7 +29,7 @@
 #	GIT_REVISION.${id}
 #		The revision to check out.
 #
-#		Example: 4b825dc642cb6eb9a060e54bf8d69288fbee4904
+#		Example: 8a311b3069ee79731eec38ca13eb13772cc49223
 #
 #	GIT_TAG.${id}
 #		The tag to check out.