8343125: Correct the documentation for TreeMap's getFloorEntry and getCeilingEntry

Reviewed-by: liach, acobbs

Author: namannigam

src/java.base/share/classes/java/util/TreeMap.java

@@ -420,10 +420,9 @@ else if (cmp > 0)
     }
 
     /**
-     * Gets the entry corresponding to the specified key; if no such entry
-     * exists, returns the entry for the least key greater than the specified
-     * key; if no such entry exists (i.e., the greatest key in the Tree is less
-     * than the specified key), returns {@code null}.
+     * Returns the entry for the least key greater than or equal to the specified key;
+     * if no such entry exists (i.e. the specified key is greater than any key in the tree,
+     * or the tree is empty), returns {@code null}.
      */
     final Entry<K,V> getCeilingEntry(K key) {
         Entry<K,V> p = root;
@@ -453,10 +452,9 @@ final Entry<K,V> getCeilingEntry(K key) {
     }
 
     /**
-     * Gets the entry corresponding to the specified key; if no such entry
-     * exists, returns the entry for the greatest key less than the specified
-     * key; if no such entry exists (i.e., the least key in the Tree is greater
-     * than the specified key), returns {@code null}.
+     * Returns the entry for the greatest key less than or equal to the specified key;
+     * if no such entry exists (i.e. the specified key is less than any key in the tree,
+     * or the tree is empty), returns {@code null}.
      */
     final Entry<K,V> getFloorEntry(K key) {
         Entry<K,V> p = root;