fix readme Configuration Tags for security (#12595)

* fix readme Configuration Tags for security

* also Composite packages

Author: cataggar

specification/security/resource-manager/readme.md

@@ -20,7 +20,7 @@ To see additional help and options, run:
 
 ## Configuration
 
-## Suppression
+### Suppression
 
 ``` yaml
 directive:
@@ -73,7 +73,7 @@ openapi-type: arm
 tag: package-composite-v3
 ```
 
-## Composite packages
+### Composite packages
 
 The following packages may be composed from multiple api-versions.