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.
(cherry picked from commit cf27c06229)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Miss Islington (bot) 2019-01-17 16:07:10 -08:00 committed by GitHub
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@ -76,17 +76,6 @@ the following::
root = tix.Tk()
root.tk.eval('package require Tix')
If this fails, you have a Tk installation problem which must be resolved before
proceeding. Use the environment variable :envvar:`TIX_LIBRARY` to point to the
installed Tix library directory, and make sure you have the dynamic
object library (:file:`tix8183.dll` or :file:`libtix8183.so`) in the same
directory that contains your Tk dynamic object library (:file:`tk8183.dll` or
:file:`libtk8183.so`). The directory with the dynamic object library should also
have a file called :file:`pkgIndex.tcl` (case sensitive), which contains the
line::
package ifneeded Tix 8.1 [list load "[file join $dir tix8183.dll]" Tix]
Tix Widgets
-----------