MINOR: Bump documentation version to 2.1
The documentation version of 2.1.0 RC1 is still at 2.0. Updated it to 2.1.
Author: Vahid Hashemian
Reviewers: Dong Lin
Closes from vahidhashemian/minor/update_version_in_documentation_for_2.1.0
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<h1>Documentation</h1>
- <h3>Kafka 2.0 Documentation</h3>
- Prior releases: <a href="/07/documentation.html">0.7.x</a>, <a href="/08/documentation.html">0.8.0</a>, <a href="/081/documentation.html">0.8.1.X</a>, <a href="/082/documentation.html">0.8.2.X</a>, <a href="/090/documentation.html">0.9.0.X</a>, <a href="/0100/documentation.html">0.10.0.X</a>, <a href="/0101/documentation.html">0.10.1.X</a>, <a href="/0102/documentation.html">0.10.2.X</a>, <a href="/0110/documentation.html">0.11.0.X</a>, <a href="/10/documentation.html">1.0.X</a>, <a href="/11/documentation.html">1.1.X</a>.
+ <h3>Kafka 2.1 Documentation</h3>
+ Prior releases: <a href="/07/documentation.html">0.7.x</a>, <a href="/08/documentation.html">0.8.0</a>, <a href="/081/documentation.html">0.8.1.X</a>, <a href="/082/documentation.html">0.8.2.X</a>, <a href="/090/documentation.html">0.9.0.X</a>, <a href="/0100/documentation.html">0.10.0.X</a>, <a href="/0101/documentation.html">0.10.1.X</a>, <a href="/0102/documentation.html">0.10.2.X</a>, <a href="/0110/documentation.html">0.11.0.X</a>, <a href="/10/documentation.html">1.0.X</a>, <a href="/11/documentation.html">1.1.X</a>, <a href="/20/documentation.html">2.0.X</a>.
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