Bump rexml from 3.2.4 to 3.2.5 in /docs (#8251)

Summary:
Bumps [rexml](https://github.com/ruby/rexml) from 3.2.4 to 3.2.5.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/ruby/rexml/blob/master/NEWS.md">rexml's changelog</a>.</em></p>
<blockquote>
<h2>3.2.5 - 2021-04-05 {#version-3-2-5}</h2>
<h3>Improvements</h3>
<ul>
<li>
<p>Add more validations to XPath parser.</p>
</li>
<li>
<p><code>require &quot;rexml/document&quot;</code> by default.
[GitHub#36][Patch by Koichi ITO]</p>
</li>
<li>
<p>Don't add <code>#dcloe</code> method to core classes globally.
[GitHub#37][Patch by Akira Matsuda]</p>
</li>
<li>
<p>Add more documentations.
[Patch by Burdette Lamar]</p>
</li>
<li>
<p>Added <code>REXML::Elements#parent</code>.
[GitHub#52][Patch by Burdette Lamar]</p>
</li>
</ul>
<h3>Fixes</h3>
<ul>
<li>
<p>Fixed a bug that <code>REXML::DocType#clone</code> doesn't copy external ID
information.</p>
</li>
<li>
<p>Fixed round-trip vulnerability bugs.
See also: <a href="https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965/">https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965/</a>
[HackerOne#1104077][CVE-2021-28965][Reported by Juho Nurminen]</p>
</li>
</ul>
<h3>Thanks</h3>
<ul>
<li>
<p>Koichi ITO</p>
</li>
<li>
<p>Akira Matsuda</p>
</li>
<li>
<p>Burdette Lamar</p>
</li>
<li>
<p>Juho Nurminen</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="a622645e98"><code>a622645</code></a> Add 3.2.5 entry</li>
<li><a href="3c137eb119"><code>3c137eb</code></a> Fix a parser bug that some data may be ignored before DOCTYPE</li>
<li><a href="9b311e59ae"><code>9b311e5</code></a> Fix a bug that invalid document declaration may be accepted</li>
<li><a href="f9d88e4948"><code>f9d88e4</code></a> Fix a bug that invalid document declaration may be generated</li>
<li><a href="f7bab89375"><code>f7bab89</code></a> Fix a bug that invalid element end may be accepted</li>
<li><a href="6a250d2cd1"><code>6a250d2</code></a> Fix a bug that invalid element start may be accepted</li>
<li><a href="2fe62e2909"><code>2fe62e2</code></a> Fix a bug that invalid notation declaration may be accepted</li>
<li><a href="a659c63e37"><code>a659c63</code></a> Fix a bug that invalid notation declaration may be generated</li>
<li><a href="790dd113ce"><code>790dd11</code></a> Use ruby/setup-ruby (<a href="https://github-redirect.dependabot.com/ruby/rexml/issues/66">https://github.com/facebook/rocksdb/issues/66</a>)</li>
<li><a href="eda1b2007d"><code>eda1b20</code></a> Clean up and enhance high-level RDoc (<a href="https://github-redirect.dependabot.com/ruby/rexml/issues/65">https://github.com/facebook/rocksdb/issues/65</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/ruby/rexml/compare/v3.2.4...v3.2.5">compare view</a></li>
</ul>
</details>
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</details>

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8251

Reviewed By: jay-zhuang

Differential Revision: D28163644

Pulled By: ajkr

fbshipit-source-id: 7c0e8bf30c70f53db691076b396c0b748fa9380d

docs/Gemfile.lock

@@ -225,7 +225,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.4)
+    rexml (3.2.5)
     rouge (3.23.0)
     ruby-enum (0.8.0)
       i18n