DOCSP-46361 Clarify FIPS140-2 level for A4G (#73)

Author: kanchana-mongodb

source/security.txt

@@ -27,7 +27,8 @@ and |cloudgov-short| does not allow |tls| versions less than 1.2.
 |fips| 140-2
 ~~~~~~~~~~~~
 
-|cloudgov-short| automatically enables |fips| 140-2 for all databases. 
+|cloudgov-short| automatically enables |fips| 140-2 level 2 for all
+databases.  
 
 Required Security Features
 --------------------------