Requirements yaml expected service names to be lowercase

Fix comments

Change-Id: I2d96c7a210e73326ed5e56c46db3be2cb53cf61d
diff --git a/etc/patrole.conf.sample b/etc/patrole.conf.sample
index 6433f40..42f1042 100644
--- a/etc/patrole.conf.sample
+++ b/etc/patrole.conf.sample
@@ -81,7 +81,7 @@
 #
 # Where:
 #
-# service = the service that is being tested (Cinder, Nova, etc.).
+# service = the service that is being tested (cinder, nova, etc.).
 #
 # api_action = the policy action that is being tested. Examples:
 #