Fix typo

Closes GH-1949.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: jbesomi

docs/docs/what-is-mdx.server.mdx

@@ -158,7 +158,7 @@ Some markdown features don’t work in MDX:
     ```
 *   Autolinks do not work in MDX.
     The reason is that they can be indistinguishable from JSX (for example:
-    `<svg:rect>`) and we prefer being expicit.
+    `<svg:rect>`) and we prefer being explicit.
     If you want links, use full links:
     `[descriptive text](https://and-the-link-here.com)`
 *   HTML syntax doesn’t work in MDX as it’s replaced by JSX (`<img>` to