Typo

src/BPTree.c

@@ -605,7 +605,7 @@ static bool _BPTree_delete(BPTreeNode *parent, BPTreeNode *root, uint64_t key) {
     int index;
     bool is_found = IntegerArray_binary_search(root->keys, key, &index);
     if (root->is_leaf && !is_found) {
-        // The key cannot be inserted because it doesn't exists.
+        // The key cannot be deleted because it doesn't exists.
         return false;
     }