docs: correct namespaces examples to have values (#25)

## PR Checklist

- [x] Addresses an existing open issue: fixes #23
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/eslint-plugin-erasable-syntax-only/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/eslint-plugin-erasable-syntax-only/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

A pure docs fix.

💖

Author: JoshuaKGoldberg

docs/rules/namespaces.md

@@ -2,9 +2,14 @@
 
 <!-- end auto-generated rule header -->
 
-Enforces that code doesn't use TypeScript's `namespaces`s:
+Enforces that code doesn't use TypeScript's `namespaces` with values:
 
 ```ts
-module Values {}
-namespace Values {}
+module Values {
+	export const value = "a";
+}
+
+namespace Values {
+	export const value = "a";
+}
 ```