[epiphany] HACKING: add note about comments

[Xan Lopez <xan src gnome org>]

commit d9dc07d5e89f56871d6df629015226c4e0ddb133
Author: Xan Lopez <xlopez igalia com>
Date:   Thu Sep 8 22:56:32 2011 +0200

    HACKING: add note about comments

 HACKING |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/HACKING b/HACKING
index 37ae5f8..d94d5b7 100644
--- a/HACKING
+++ b/HACKING
@@ -13,6 +13,8 @@ need to stick to in order to get your patch accepted:
   the primary header, followed by a blank line, followed by all the
   local headers sorted alphabetically, followed by a blank line,
   followed by all the system headers sorted alphabetically.
+- Make comments full sentences. This means proper capitalization and
+  punctuation.
 
 - data/kr-gnome-indent.cfg is provided as a reference config file for the
   uncrustify program to get correct indentation in new files.