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bpo-23156: Remove obsolete tix install directions (GH-11595)

Tix was deprecated in 3.6 and the doc is wrong.  New users should use ttk.
T
Terry Jan Reedy committed
cf27c06229eb4b8280bb5f2b93a57e33163411f4
Parent: 56c1605
Committed by GitHub <noreply@github.com> on 1/18/2019, 12:00:51 AM