[librsvg] CONTRIBUTING.md: markup fixes

[Federico Mena Quintero <federico src gnome org>]

commit 1872206d3878746d3cdeb5c1b4b09b5bb3a5711a
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Nov 30 13:37:38 2017 -0600

    CONTRIBUTING.md: markup fixes

 CONTRIBUTING.md |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b0551ec..27847d3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -10,7 +10,7 @@ contributing to librsvg, and we appreciate all of them.
 * [Pull requests](#pull-requests)
 
 There is a **code of conduct** for contributors to librsvg; please see the
-file `[code_of_conduct.md][coc]`.
+file [`code_of_conduct.md`][coc].
 
 ## Source repository