Add blank lines around lists

See https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md#md032

crates/compiler/builtins/README.md

@@ -21,6 +21,7 @@ Towards the bottom of `symbol.rs` there is a `define_builtins!` macro being used
 Some of these have `#` inside their name (`first#list`, `#lt` ..). This is a trick we are doing to hide implementation details from Roc programmers. To a Roc programmer, a name with `#` in it is invalid, because `#` means everything after it is parsed to a comment. We are constructing these functions manually, so we are circumventing the parsing step and dont have such restrictions. We get to make functions and values with `#` which as a consequence are not accessible to Roc programmers. Roc programmers simply cannot reference them.
 
 But we can use these values and some of these are necessary for implementing builtins. For example, `List.get` returns tags, and it is not easy for us to create tags when composing LLVM. What is easier however, is:
+
 - ..writing `List.#getUnsafe` that has the dangerous signature of `List elem, Nat -> elem` in LLVM
 - ..writing `List elem, Nat -> Result elem [OutOfBounds]*` in a type safe way that uses `getUnsafe` internally, only after it checks if the `elem` at `Nat` index exists.