Update source/installguide/optional_installation.rst

Co-authored-by: Pearl Dsilva <pearl1594@gmail.com>

Author: daviftorres

source/installguide/optional_installation.rst

@@ -117,7 +117,7 @@ and configure the same in the server.properties file as illustrated above.
 Health Checks and Monitoring (Optional)
 ---------------------------------------
 
-CloudStack as a plugin for exporting metrics in the format that Prometheus can consume.
+CloudStack has a plugin for exporting metrics in the format that Prometheus can consume.
 This is done by enabling the following configuration parameters in the Global Settings.
 
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