Fix docs compile error (extra space in comment closer)

diff --git a/commits.xml b/commits.xml
index f530f21..6077f10 100644
--- a/commits.xml
+++ b/commits.xml
@@ -1,2 +1,2 @@
 <?xml version="1.0"?>
-<!-- not used this release -- >
\ No newline at end of file
+<!-- not used this release -->
\ No newline at end of file