Update using_pyodide_from_javascript.md

docs/using_pyodide_from_javascript.md

@@ -9,7 +9,7 @@ Iodide](using_pyodide_from_iodide.md).
 Include `pyodide.js` in your project.
 
 This has a single `Promise` object which bootstraps the Python environment:
-`languagePluginLoader`. Since this must happen asynchronously, it returns a
+`languagePluginLoader`. Since this must happen asynchronously, it is a
 `Promise`, which you must call `then` on to complete initialization. When the
 promise resolves, pyodide will have installed a namespace in global scope:
 `pyodide`.