Auto merge of #60451 - rasendubi:binaryheap-min-heap, r=scottmcm
Auto merge of #60451 - rasendubi:binaryheap-min-heap, r=scottmcm

BinaryHeap: add min-heap example

Fixes #58174.

aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust