docs: fix typo in ES modules article (#1830)

Author: jlecordier

docs/guides/going-buildless/es-modules.md

@@ -154,7 +154,7 @@ Popular collections of forks are [@esm-bundle](https://github.com/esm-bundle/) a
 
 ### Create a UMD wrapper
 
-UMD modules are "universal modules", meaning they support multiple module formats in a single file. It's quite an old standard, and it doesn't support standard es modules, so it's not quite "universal" anymore. However, many libraries ship a UMD version where the library and it's dependencies are bundled into a single file. It's been the way to ship code for the browser for a long time.
+UMD modules are "universal modules", meaning they support multiple module formats in a single file. It's quite an old standard, and it doesn't support standard es modules, so it's not quite "universal" anymore. However, many libraries ship a UMD version where the library and its dependencies are bundled into a single file. It's been the way to ship code for the browser for a long time.
 
 You can actually import these libraries using a module import, but instead of exporting something, the UMD module will register itself to the window. You can set up a proxy file to reexport this variable from the window.