Improve variable name in search example.
Improve variable name in search example.

unikent/splunk-sdk-php,splunk/splunk-sdk-php,splunk/splunk-sdk-php,unikent/splunk-sdk-php,shakeelmohamed/splunk-sdk-php,shakeelmohamed/splunk-sdk-php,unikent/splunk-sdk-php,splunk/splunk-sdk-php,shakeelmohamed/splunk-sdk-php