scons: emit correct message before installing git hook

Change-Id: Ied2e018a9a1b6db446edbaac871ac4efd795ec36
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
diff --git a/SConstruct b/SConstruct
index 9f277d2..5e4eca9 100755
--- a/SConstruct
+++ b/SConstruct
@@ -265,12 +265,14 @@
 
 style_message = """
 You're missing the gem5 style hook, which automatically checks your code
-against the gem5 style rules on hg commit and qrefresh commands.  This
-script will now install the hook in your %s.
+against the gem5 style rules on %s.
+This script will now install the hook in your %s.
 Press enter to continue, or ctrl-c to abort: """
 
-mercurial_style_message = style_message % ".hg/hgrc file"
-git_style_message = style_message % ".git/hooks/ directory"
+mercurial_style_message = style_message % ("hg commit and qrefresh commands",
+                                           ".hg/hgrc file")
+git_style_message = style_message % ("'git commit'",
+                                     ".git/hooks/ directory")
 
 mercurial_style_upgrade_message = """
 Your Mercurial style hooks are not up-to-date. This script will now