Fix typo on overview page.

content/index.html

@@ -10,7 +10,7 @@ title: Home
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       <h2><i class="fa fa-search"></i> Query language</h2>
-      <p class="desc">A flexible query languge allows slicing and dicing of collected time series data in order to generate ad-hoc graphs, tables, and alerts.</p>
+      <p class="desc">A flexible query language allows slicing and dicing of collected time series data in order to generate ad-hoc graphs, tables, and alerts.</p>
       <p><a class="btn btn-default" href="/docs/querying/basics/" role="button">View details &raquo;</a></p>
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