docs: update branch for wez/wezterm
The old reference used master, but this renames it from `master` -> `main` as standard with wezterm.
@@ -236,7 +236,7 @@ $ infocmp
[prompt_toolkit]: https://github.com/jonathanslenders/python-prompt-toolkit
[reedline]: https://github.com/nushell/reedline
[replxx]: https://github.com/AmokHuginnsson/replxx
-[termwiz]: https://github.com/wez/wezterm/tree/master/termwiz
+[termwiz]: https://github.com/wez/wezterm/tree/main/termwiz
## Multi line support
