[retro-gtk] hacking: Drop periods after issue references

[Adrien Plazas <aplazas src gnome org>]

commit 8c23e0c28073de4e3e649ded9c0580ca4733a9ec
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Oct 14 08:23:57 2020 +0200

    hacking: Drop periods after issue references

 HACKING.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/HACKING.md b/HACKING.md
index d46f1050..7602ceb5 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -11,7 +11,7 @@ any external or private interfaces changed, what bugs were fixed (with
 bug tracker reference if applicable) and so forth. Be concise but not
 too brief.
 
-Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1.
+Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1
 ```
 
 ### The Tag
@@ -99,18 +99,18 @@ to RetroMyType to allow…
 ### The Issue Reference
 
 If there is an issue fixed by your commit, specify it at the end of your commit
-message. It must be in the following format: `Fixes $ISSUE_URL.`.
+message. It must be in the following format: `Fixes $ISSUE_URL`.
 
 Do not simply use the issue number.
 
 Good issue references:
 ```
-Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1.
+Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1
 ```
 
 Bad issue references:
 ```
 Fixes #1
-Fix https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1.
-Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1
+Fix https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1
+Fixes https://gitlab.gnome.org/GNOME/retro-gtk/-/issues/1.
 ```