rephrase the defintion of agent-based installer

Author: Amrita

installing/installing_with_agent_based_installer/preparing-to-install-with-agent-based-installer.adoc

@@ -7,7 +7,7 @@ include::_attributes/common-attributes.adoc[]
 toc::[]
 
 == About the Agent-based Installer
-The Agent-based Installer is a combination of the Assisted Installer (AI) technology and the installer-provisioned infrastructure (IPI). It is a subcommand that resides in the {product-title} installer and also utilizes the {product-title} installer for the input asset management.
+The Agent-based Installer provides the flexibility of user-provided infrastructure (UPI) installation and the ease of use of the Assisted Installer (AI). It is a subcommand that resides in the {product-title} installer, and also uses the {product-title} installer for the input asset management.
 It generates a bootable image containing all of the information required to deploy an {product-title} cluster.
 
 The Agent-based Installer is a sub-command that generates a live {op-system-first} ISO. The live ISO runs all of the required components that are running in containers pulled from the {product-title} release payload.