PLD-doc: BuildRequires.txt - updated noarch subpackage dependency

[Elan Ruusamäe]

On 05.03.2021 21:59, qboosh wrote:

> +# subpackage with BuildArch: noarch
> +BuildRequires:	rpm-build >= 4.6
> +# (with epoch 0 covers both rpm.org 4.6+ (>= 1:4.6) / rpm5 (>= 5.0);
> +# it's mostly informational, rpm 4.5 will bail with syntax error,
> +# before noticing unfulfilled dependency)
> +
Epoch: 1 was introduced in 4.16, not before