Make it clearer that we're talking about PromQL. (#1236)

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>

content/index.html

@@ -23,7 +23,7 @@ layout: jumbotron
     <div class="col-md-3 col-sm-6 col-xs-12 feature-item">
       <a href="/docs/prometheus/latest/querying/basics/">
         <h2><i class="fa fa-search"></i> Powerful queries</h2>
-        <p>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>PromQL allows slicing and dicing of collected time series data in order to generate ad-hoc graphs, tables, and alerts.</p>
       </a>
     </div>
     <div class="col-md-3 col-sm-6 col-xs-12 feature-item">
@@ -50,7 +50,7 @@ layout: jumbotron
     <div class="col-md-3 col-sm-6 col-xs-12 feature-item">
       <a href="/docs/prometheus/latest/configuration/alerting_rules/">
         <h2><i class="fa fa-warning"></i> Precise alerting</h2>
-        <p>Alerts are defined based on Prometheus's flexible query language and maintain dimensional information. An alertmanager handles notifications and silencing.</p>
+        <p>Alerts are defined based on Prometheus's flexible PromQL and maintain dimensional information. An alertmanager handles notifications and silencing.</p>
       </a>
     </div>
     <div class="col-md-3 col-sm-6 col-xs-12 feature-item">