<h3>Contribution description</h3>
<p>Now that <code>HEXFILE</code> is not overwritten to a <code>.bin</code> anymore and <code>BINFILE</code> always a binary file, the documentation can be clarified.</p>
<h3>Testing procedure</h3>
<p>Review the new documentation in <code>makefiles/vars.inc.mk</code>.</p>
<p>The value of <code>HEXFILE</code> is not overwritten anymore (to BINFILE in particular)</p>
<pre><code>git grep 'HEXFILE \?:\?=' '**' ':!boards/common/msba2/tools/flashutil.sh'
# empty
</code></pre>
<p>The value can be seen in the <code>info-build</code> output.</p>
<pre><code>make -C examples/hello-world/ info-build | grep FILE:  | head -n 4
ELFFILE: /home/harter/work/git/RIOT/examples/hello-world/bin/native/hello-world.elf
HEXFILE: /home/harter/work/git/RIOT/examples/hello-world/bin/native/hello-world.hex
BINFILE: /home/harter/work/git/RIOT/examples/hello-world/bin/native/hello-world.bin
FLASHFILE: /home/harter/work/git/RIOT/examples/hello-world/bin/native/hello-world.elf
</code></pre>
<h3>Issues/PRs references</h3>
<p>Part of <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="308966540" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/8838" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/8838/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/8838">#8838</a></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/11845'>https://github.com/RIOT-OS/RIOT/pull/11845</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>makefiles/vars.inc.mk: update documentation for HEXFILE</li>
  <li>makefiles: documentation for BINFILE</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11845/files#diff-0">makefiles/info.inc.mk</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11845/files#diff-1">makefiles/vars.inc.mk</a>
    (5)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11845.patch'>https://github.com/RIOT-OS/RIOT/pull/11845.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11845.diff'>https://github.com/RIOT-OS/RIOT/pull/11845.diff</a></li>
</ul>

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