let bindings can now be refutable too

Author: est31

src/items/functions.md

@@ -59,8 +59,8 @@ fn answer_to_life_the_universe_and_everything() -> i32 {
 
 ## Function parameters
 
-As with `let` bindings, function parameters are irrefutable [patterns], so any
-pattern that is valid in a let binding is also valid as a parameter:
+Function parameters are irrefutable [patterns], so any pattern that is valid in
+an else-less `let` binding is also valid as a parameter:
 
 ```rust
 fn first((value, _): (i32, i32)) -> i32 { value }