chore: updated product doc link

We have a new URL for product documentation.

README.md

@@ -5,7 +5,7 @@ Convert2RHEL is a tool to convert RHEL-like systems to their RHEL counterparts.
 ## Usage
 For details about the utility and its usage, consult one of the following sources:
 
-1. [Converting from an RPM-based Linux distribution to RHEL](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/converting_from_an_rpm-based_linux_distribution_to_rhel/index)
+1. [Converting from an RPM-based Linux distribution to RHEL](https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html-single/converting_from_a_linux_distribution_to_rhel_using_the_convert2rhel_utility/index)
 1. Run `man convert2rhel` once the utility is installed on your system
 
 ### Automation