Sample config file fix + Indent spacing fix

config.sample.yml

@@ -102,4 +102,7 @@ git:
     # Only for SSH authentication:
     publicKey: /etc/wiki/keys/git.pem
     privateKey: /etc/wiki/keys/git.pem
-    sslVerify: true
+    sslVerify: true
+  signature:
+    name: Marty
+    email: marty@example.com