Add a 6th edition Help link

mhartl · mhartl · commit 129b6985c061 · 2022-04-20T10:45:37.000-07:00
diff --git a/HELP.md b/HELP.md
@@ -2,6 +2,8 @@
 
 This is the Help page for the [*Ruby on Rails Tutorial*](https://www.railstutorial.org/) (7th Edition) by [Michael Hartl](https://www.michaelhartl.com/).
 
+See also the [6th edition Help page](https://github.com/learnenough/sample_app_6th_ed/blob/main/HELP.md).
+
 ## General suggestions
 
 Web development is a tricky business, and despite our collective best efforts it’s likely that you’ll run into trouble at some point. If you do, I suggest comparing your code to the [reference implementation of the sample app](https://github.com/learnenough/rails_tutorial_sample_app_7th_ed) to track down any discrepancies. You can also post your question at [Stack Overflow](https://stackoverflow.com/), but I suggest you do so after trying all the debugging tips listed below.
