Bump rexml from 3.2.4 to 3.2.5 in /docs (facebook#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="https://github.com/ruby/rexml/commit/a622645e980ea5b91ad7b4d6fec32d113f15df88"><code>a622645</code></a> Add 3.2.5 entry</li>
<li><a href="https://github.com/ruby/rexml/commit/3c137eb119550874b2b3e27d12b733ca67033377"><code>3c137eb</code></a> Fix a parser bug that some data may be ignored before DOCTYPE</li>
<li><a href="https://github.com/ruby/rexml/commit/9b311e59ae05749e082eb6bbefa1cb620d1a786e"><code>9b311e5</code></a> Fix a bug that invalid document declaration may be accepted</li>
<li><a href="https://github.com/ruby/rexml/commit/f9d88e4948b4a43294c25dc0edb16815bd9d8618"><code>f9d88e4</code></a> Fix a bug that invalid document declaration may be generated</li>
<li><a href="https://github.com/ruby/rexml/commit/f7bab8937513b1403cea5aff874cbf32fd5e8551"><code>f7bab89</code></a> Fix a bug that invalid element end may be accepted</li>
<li><a href="https://github.com/ruby/rexml/commit/6a250d2cd1194c2be72becbdd9c3e770aa16e752"><code>6a250d2</code></a> Fix a bug that invalid element start may be accepted</li>
<li><a href="https://github.com/ruby/rexml/commit/2fe62e29094d95921d7e19abbd2e26b23d78dc5b"><code>2fe62e2</code></a> Fix a bug that invalid notation declaration may be accepted</li>
<li><a href="https://github.com/ruby/rexml/commit/a659c63e37414506dfb0d4655e031bb7a2e73fc8"><code>a659c63</code></a> Fix a bug that invalid notation declaration may be generated</li>
<li><a href="https://github.com/ruby/rexml/commit/790dd113ce693ce831cbbc53f2f990a317643f75"><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="https://github.com/ruby/rexml/commit/eda1b2007dd8751f381bf741f16c9e33c5d3e52a"><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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Pull Request resolved: facebook#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