Rollup merge of rust-lang#122074 - KonradHoeffner:patch-2, r=jhpratt

Add missing PartialOrd trait implementation doc for array

Analogously to vectors and slices, this PR documents the lexicographic sorting of PartialOrd as rustdoc comment on the trait implementation of PartialOrd for arrays.
Associated issue: rust-lang#122073.

library/core/src/array/mod.rs

@@ -360,6 +360,7 @@ where
     }
 }
 
+/// Implements comparison of arrays [lexicographically](Ord#lexicographical-comparison).
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: PartialOrd, const N: usize> PartialOrd for [T; N] {
     #[inline]