chore(doc): use faq for finding helix log file (#963)

README.md

@@ -71,7 +71,7 @@ Some suggestions to get started:
 
 - You can look at the [good first issue](https://github.com/helix-editor/helix/labels/E-easy) label on the issue tracker.
 - Help with packaging on various distributions needed!
-- To use print debugging to the `~/.cache/helix/helix.log` file, you must:
+- To use print debugging to the [Helix log file](https://github.com/helix-editor/helix/wiki/FAQ#access-the-log-file), you must:
   * Print using `log::info!`, `warn!`, or `error!`. (`log::info!("helix!")`)
   * Pass the appropriate verbosity level option for the desired log level. (`hx -v <file>` for info, more `v`s for higher severity inclusive)
 - If your preferred language is missing, integrating a tree-sitter grammar for