tutorial update str interpolation syntax

[Anton-4]

The tutorial was still using the deprecated string interpolation syntax.

[bottlenecked]

If $(...) is the new string interpolation syntax, then I guess this part under the 'Friendly' page should be removed/changed?

https://www.roc-lang.org/friendly

"Name: \(Str.trim name)" uses string interpolation syntax: a backslash inside a string literal, followed by an expression in parentheses. This code is the same as combining the string "Name: " with the string returned by the function call Str.trim name.

Because Roc's string interpolation syntax begins with a backslash (just like other backlash-escapes such as \n and "), you can always tell which parts of a string involve special handling: the parts that begin with backslashes. Everything else works as normal.

[Anton-4]

Thanks for letting us know @bottlenecked, this is fixed in #6488