Fix typo in useMatch documentation

Author: thomasbuilds

src/routes/solid-router/reference/primitives/use-match.mdx

@@ -14,7 +14,7 @@ return <div classList={{ active: Boolean(match()) }} />;
 As a second parameter, `useMatch` also accepts a group of `MatchFilters`.
 These filters allow for a more granular check.
 
-The filters are the same used by the `<Router>` itself and they accept either a an array of strings, or a regular expression. Additionally, there's a `boolean` option to match a route only if it has, or doesn't have, the HTML extension.
+The filters are the same used by the `<Router>` itself and they accept either an array of strings, or a regular expression. Additionally, there's a `boolean` option to match a route only if it has, or doesn't have, the HTML extension.
 
 ```js
 const filters: MatchFilters = {