Make the example URL not a link, since it requires substitutions

Reported-by:	emaste
Sponsored-by:	Klara Inc.

website/content/en/snapshots/_index.adoc

@@ -17,7 +17,7 @@ The latest snapshots made available can be found on the FreeBSD FTP mirrors at t
 
 Please note that sometimes the snapshots available to download may be somewhat outdated.
 
-Currently the snapshots of link:{handbook}#CURRENT[-CURRENT] and link:{handbook}#STABLE[-STABLE] are available in directories whose URLs have the format _https://download.FreeBSD.org/ftp/snapshots/<target>/<target_arch>/_ where `<target>` and `<target_arch>` represent the architecture for which the snapshot was built. For each supported platform, the snapshot includes ISO images of the `bootonly`, `release`, and `memstick` images.
+Currently the snapshots of link:{handbook}#CURRENT[-CURRENT] and link:{handbook}#STABLE[-STABLE] are available in directories whose URLs have the format _\https://download.FreeBSD.org/ftp/snapshots/<target>/<target_arch>/_ where `<target>` and `<target_arch>` represent the architecture for which the snapshot was built. For each supported platform, the snapshot includes ISO images of the `bootonly`, `release`, and `memstick` images.
 
 == Things You Might Want to Know