docs: configuration/supported-browsers typo fix

Author: vsn4ik

apps/website/content/docs/configuration/supported-browsers.mdx

@@ -73,7 +73,7 @@ If `targets` is not specified, SWC uses `browserslist` to get target information
 - Possible values: `usage`, `entry`, `undefined` (this matches [`useBuiltIns`](https://babeljs.io/docs/en/babel-preset-env#usebuiltins) from Babel)
 
 <Callout emoji="⚠️">
-  The <code>usage</code> mode is currently not as efficient as Babel, iff you have a usage like `"foo"["a" + "t"]()`.
+  The <code>usage</code> mode is currently not as efficient as Babel, if you have a usage like `"foo"["a" + "t"]()`.
   SWC does not evaluate the expression <code>"a" + "t"</code> and will not include the <code>String.prototype.at</code> polyfill.
 </Callout>