Added comments on settings.

spring-security-modules/spring-security-saml/src/main/resources/application.properties

@@ -1,6 +1,8 @@
 saml.keystore.location=classpath:/saml/samlKeystore.jks
+# Password for Java keystore and item therein
 saml.keystore.password=<key_pass>
 saml.keystore.alias=<key_alias>
 
+# SAML Entity ID extracted from top of SAML metadata file
 saml.idp=<idp_issuer_url>
 saml.sp=http://localhost:8080/saml/metadata