README: remove out of place emdashes

This removes emdashes in the README. In other places in the README,
colons are used.

Signed-off-by: Evan Castillo <eycastio@icloud.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260627210938.85899-1-eycastio@icloud.com>
This commit is contained in:
Evan Castillo 2026-06-27 16:09:38 -05:00 • committed by Jonathan Corbet
commit f9264ded3e