[shotwell] help: Fix wrong author credits markup

[Andre Klapper <aklapper src gnome org>]

commit f77181d8ef2606d9115d02d0744f2dfdef5ae9a4
Author: Andre Klapper <aklapper wikimedia org>
Date:   Fri Sep 6 10:36:23 2019 +0200

    help: Fix wrong author credits markup

 help/C/index.page | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/help/C/index.page b/help/C/index.page
index e3221bb8..8617f376 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -5,14 +5,22 @@
        <info>
                <title type="link">Shotwell</title>
                <credit type="author">
-                   <name>Jim Nelson</name>
-                   <email>jim yorba org</email>
-                   <name>Allison Barlow</name>
-                   <email>allison yorba org</email>
+                       <name>Jim Nelson</name>
+                       <email>jim yorba org</email>
+               </credit>
+               <credit type="author">
+                       <name>Allison Barlow</name>
+                       <email>allison yorba org</email>
+               </credit>
+               <credit type="author">
                        <name>Robert Ancell</name>
                        <email>robert ancell canonical com</email>
+               </credit>
+               <credit type="author">
                        <name>Peter Smith</name>
                        <email>pdo smith gmail com</email>
+               </credit>
+               <credit type="author">
                        <name>Phil Bull</name>
                        <email>philbull gmail com</email>
                </credit>