BACKLOG: added item about EEx tags; cleaned up others

Author: azizk

BACKLOG.md

@@ -2,8 +2,6 @@
 
 The backlog contains tasks that are planned to be worked on or ideas that may be useful.
 
+* EEx/HEEx: fix matching EEx tags inside `script` and `style` tags, the CSS `style=""` and the JS `on...=""` attributes.
 * Elixir: match do-block after function call: `func(a, b) do end`.
-* Elixir: allow setting the seed used for `mix test` via a command or similar.
-* Elixir: use ST4's branching feature to improve some rules.
-* Elixir: try to fix the rules that don't work due to the "context sanity limit" error.
-* Elixir: highlight `:atom`, `identifier`, `Module.X`, `M.func/1` in Markdown comments?
+* Elixir: use ST4's branching feature to improve syntax matching rules.