[gtksourceview: 1/2] doc: correct typo in HACKING

[Christian Hergert <chergert src gnome org>]

commit 34ba9e99305ec37a3fc3be3264902179771f7fe9
Author: Erik Faye-Lund <kusmabite gmail com>
Date:   Thu Jun 30 10:17:32 2022 +0000

    doc: correct typo in HACKING

 HACKING | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/HACKING b/HACKING
index a3e20fe4..38d68922 100644
--- a/HACKING
+++ b/HACKING
@@ -135,7 +135,7 @@ Here are some general advices:
     underlying library.
 
   - Public API should have precondition guards using g_return_if_fail() or
-    g_return_val_if_fail(). Optionally, you may do this before returnin values
+    g_return_val_if_fail(). Optionally, you may do this before returning values
     from the function to help catch bugs earlier in the development cycle.
 
     Private functions (such as those with static) should use g_assert() to