Remove the limitation 'Policies with modifications'

Created few custom policies having 'modifications block' with various 'entityTypes'. Able to apply these policies to datapath instances in NIM. Hence removing this limitation.

Author: vvnginx

content/nim/nginx-app-protect/setup-waf-config-management.md

@@ -29,7 +29,6 @@ Complete the following prerequisites before proceeding with this guide.
 Instance Manager does not support the following NGINX App Protect features:
 
 - [Policies with external references](https://docs.nginx.com/nginx-app-protect-waf/v4/configuration-guide/configuration/#external-references)
-- [Policies with modifications](https://docs.nginx.com/nginx-app-protect-waf/v4/configuration-guide/configuration/#modifying-configurations)
 - Custom signatures
 
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