Doc: dev: data-structures: fix spelling
@@ -373,7 +373,7 @@ an element with `opmphmLookup ()`. Those indices must be known when building the
The desired return index, also known as the order is set in `OpmphmGraph->edges[i].order`.
Where `i` is the i-th element.
-The build consists of tree steps.
+The build consists of three steps.
### Initialization
