chore(config): Deleted character to improve description.

Co-authored-by: C.D. MacEachern <craig.daniel.maceachern@gmail.com>

Author: DrKJeff16

lua/wezterm/types/config.lua

@@ -512,7 +512,7 @@
 ---
 ---@field default_prog? string[]
 ---Setting this value will cause wezterm to replace the the value of the
----`$SSH_AUTH_SOCK` environment when it first starts up, and to use this value
+---`SSH_AUTH_SOCK` environment when it first starts up, and to use this value
 ---for the auth socket registered with the multiplexer server
 ---(visible via `wezterm cli list-clients`).
 ---