Docs: bad link for supported instance types in 3nic readme

[JeffGiroux]

I was randomly picking a 3nic example, and I noticed that the supported instance type link is wrong.

This template:
https://github.com/F5Networks/f5-aws-cloudformation/tree/main/supported/standalone/3nic/existing-stack/payg

Has this section...but the link points to the AWS single-nic setup page...not the cloud matrix of instance types.

https://github.com/F5Networks/f5-aws-cloudformation/tree/main/supported/standalone/3nic/existing-stack/payg#supported-instance-types-and-hypervisors

## Supported instance types and hypervisors
  - For a list of supported AWS instance types for this solutions, see http://clouddocs.f5.com/cloud/public/v1/aws/AWS_singleNIC.html#amazon-ec2-instances-for-big-ip-ve.

  - For a list versions of the BIG-IP Virtual Edition (VE) and F5 licenses that are supported on specific hypervisors and AWS, see https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ve-supported-hypervisor-matrix.html.

Please scan through the examples and validate that the referencing links are accurate. I'm not sure if there are others, as this is the only template I inspected quickly.

[shyawnkarim]

Thanks for pointing that out. We are now tracking this with internal ID ESECLDTPLT-3067.