Update heap documentation.

trekhleb · trekhleb · commit afbdb8910123 · 2018-07-08T04:29:12.000+03:00
diff --git a/src/data-structures/heap/README.md b/src/data-structures/heap/README.md
@@ -1,7 +1,8 @@
 # Heap (data-structure)
 
 In computer science, a heap is a specialized tree-based 
-data structure that satisfies the heap property.
+data structure that satisfies the heap property described
+below.
 
 In a *min heap*, if `P` is a parent node of `C`, then the
 key (the value) of `P` is less than or equal to the
