docs: correct example text for includesModifier (#177)

## PR Checklist

- [x] Addresses an existing open issue: fixes #176
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/ts-api-utils/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/ts-api-utils/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Lil docs fix.

src/modifiers.ts

@@ -11,7 +11,7 @@ import ts from "typescript";
  * ```ts
  * declare const modifiers: ts.Modifier[];
  *
- * hasModifier(modifiers, ts.SyntaxKind.AbstractKeyword);
+ * includesModifier(modifiers, ts.SyntaxKind.AbstractKeyword);
  * ```
  */
 export function includesModifier(