<h3>Contribution description</h3>
<p>Fixes warnings on the newer version of Doxygen distributed in Ubuntu 20.04.</p>
<h3>Testing procedure</h3>
<ul>
<li><code>make doc</code> on ubuntu-20.04.</li>
</ul>
<h3>Issues/PRs references</h3>

<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/16813'>https://github.com/RIOT-OS/RIOT/pull/16813</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>cpu/arm7_common: fix doxygen grouping warnings</li>
  <li>cpu/avr8_common: fix doxygen grouping warnings</li>
  <li>cpu/stm32: fix doxygen grouping warnings</li>
  <li>cpu/sam*: fix doxygen grouping warnings</li>
  <li>cpu/esp*: fix doxygen grouping warnings</li>
  <li>cpu/cc26xx_cc13xx: fix doxygen grouping warnings</li>
  <li>cpu/cortexm_common: fix doxygen grouping warnings</li>
  <li>cpu/cc2538: fix doxygen grouping warnings</li>
  <li>cpu/kinetis: fix doxygen grouping warnings</li>
  <li>cpu/riscv_common: fix doxygen grouping warnings</li>
  <li>cpu/msp430*: fix doxygen grouping warnings</li>
  <li>cpu/qnx908x: fix doxygen grouping warnings</li>
  <li>cpu/lpc1768: fix doxygen grouping warnings</li>
  <li>cpu/lpc23xx: fix doxygen grouping warnings</li>
  <li>cpu/native: fix doxygen grouping warnings</li>
  <li>cpu/mips32r2_common: fix doxygen grouping warnings</li>
  <li>dist/tools/doccheck: update exclude_patterns</li>
</ul>

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</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16813.patch'>https://github.com/RIOT-OS/RIOT/pull/16813.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16813.diff'>https://github.com/RIOT-OS/RIOT/pull/16813.diff</a></li>
</ul>

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