561de07b57
The .txt extensions were changed to .adoc in 1f010d6bdf (doc: use .adoc
extension for AsciiDoc files, 2025-01-20).
Do the same for contrib/subtree.
Signed-off-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Please read git-subtree.txt for documentation. Please don't contact me using github mail; it's slow, ugly, and worst of all, redundant. Email me instead at apenwarr@gmail.com and I'll be happy to help. Avery