August BIND releases - corrected links

[Victoria Risk]

Apologies, here are the corrected links for the release notes for the August 2024 releases:

A summary of significant changes in the new releases can be found in their release notes:

- Current supported stable branches:

    9.18.29 - https://downloads.isc.org/isc/bind9/9.18.29/doc/arm/html/notes.html
    9.20.1  - https://downloads.isc.org/isc/bind9/9.20.1/doc/arm/html/notes.html
- New development branch:
    9.21.0 - https://downloads.isc.org/isc/bind9/9.21.0/doc/arm/html/notes.html
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