[PATCH 2 of 7 clowncopter] automv: add some context for the tests

[Martijn Pieters]

# HG changeset patch
# User Martijn Pieters <mjpieters at fb.com>
# Date 1455554670 0
#      Mon Feb 15 16:44:30 2016 +0000
# Node ID 7be1e4769b796d1bae5bc361be81355b9d32ee4c
# Parent  4904e8501f80830478e78f3aef668db7500e0cfe
automv: add some context for the tests.

diff --git a/tests/test-automv.t b/tests/test-automv.t
--- a/tests/test-automv.t
+++ b/tests/test-automv.t
@@ -1,3 +1,5 @@
+Tests for the automv extension; detect moved files at commit time.
+
   $ cat >> $HGRCPATH << EOF
   > [extensions]
   > automv=