Remove incorrect duplicate phrase from build.md
Remove incorrect duplicate phrase from build.md

A phrase from the "Text files" section in build.md was incorrectly duplicated under the "Tarball contexts" section.

Signed-off-by: Peter Jaffe <a60bdbaa65cda4709e09ccbc3ec27977b2cd2469@nevo.com>
Zebrilee/cli,allencloud/cli,cpuguy83/cli,thaJeztah/cli,riyazdf/cli,e11137/cli,allencloud/cli,docker/cli,dnephin/cli,docker/cli,redpanda/cli,ashfall/cli,redpanda/cli,cpuguy83/cli,thaJeztah/cli,ashfall/cli,riyazdf/cli,dnephin/cli,Zebrilee/cli,e11137/cli