docs: clean up accept.txt

Signed-off-by: Joseph Kato <joseph@jdkato.io>

Author: jdkato

.github/styles/config/vocabularies/Vale/accept.txt

@@ -46,7 +46,6 @@ shortcodes
 signavio
 smog
 Spotify
-tch
 testthedocs
 textlint
 tox