sanity: updated docs to reflect default value for default_checks param

- reported by GH #1542

(cherry picked from commit 6ff985605b3fbb6aa350af4c21fc73afb8cf122f)
(cherry picked from commit a1a397bbf6cd6a01ccd505b7b85d448478d27cbe)

src/modules/sanity/doc/sanity_admin.xml

@@ -152,10 +152,10 @@
 		is the sum of the check numbers which should be executed by default.
 	</para>
 	<para>
-	    Default value is <quote>999</quote>. This resolves to the following list of
+	    Default value is <quote>3047</quote>. This resolves to the following list of
 		checks: ruri_sip_version (1), ruri_scheme (2), required_headers (4),
-		cseq_method (32), cseq_value (64), cotent_length (128), 
-		expires_value (256), proxy_require (512).
+		cseq_method (32), cseq_value (64), content_length (128), 
+		expires_value (256), proxy_require (512), digest credentials (2048).
 	</para>
 	<example>
 	    <title>Set <varname>default_checks</varname> parameter</title>