Update docs/api.md

Co-authored-by: Blake Williams <blakewilliams@github.com>

docs/api.md

@@ -110,7 +110,7 @@ double render if they emit the result.
 <% super %> # does not double-render
 ```
 
-`super` also does not consider the current variant. `render_parent` penders the
+`super` also does not consider the current variant. `render_parent` renders the
 parent template considering the current variant and emits the result without
 double-rendering.