<h3>Contribution description</h3>
<p>cleanup some minor spelling error found by codespell</p>
<p>they caused a notification after i pushed the green button</p>
<h3>Testing procedure</h3>
<p>read the diff</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/16805'>https://github.com/RIOT-OS/RIOT/pull/16805</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>doc: cleanup some minor spelling error found by codespell</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16805/files#diff-2673d7f9ed77c1ddd7e03c29af685af3bee96e51eabef011919c7af510ee573d">pkg/nimble/README.ipv6-over-ble.md</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16805/files#diff-b223aeb1329ac9f4ac1ca49d37975d7583737ef09bc3372795d101ea7d24201f">tests/rng/README.md</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16805.patch'>https://github.com/RIOT-OS/RIOT/pull/16805.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16805.diff'>https://github.com/RIOT-OS/RIOT/pull/16805.diff</a></li>
</ul>

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