Auto merge of rust-lang#84135 - rust-lang:GuillaumeGomez-patch-1, r=kennytm

Improve code example for length comparison

Small fix/improvement: it's much safer to check that you're under the length of an array rather than chacking that you're equal to it. It's even more true in case you update the length of the array while iterating.

Author: bors

alloc/src/vec/mod.rs

@@ -2567,7 +2567,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # let some_predicate = |x: &mut i32| { *x == 2 || *x == 3 || *x == 6 };
     /// # let mut vec = vec![1, 2, 3, 4, 5, 6];
     /// let mut i = 0;
-    /// while i != vec.len() {
+    /// while i < vec.len() {
     ///     if some_predicate(&mut vec[i]) {
     ///         let val = vec.remove(i);
     ///         // your code here