Update squid_parser.txt

Parsers/squid_parser.txt

@@ -6,6 +6,7 @@
 // 1. This parser works against the above mentioned squid version, it may need updates if squid is updated with new events or schema changes.
 // 2. This parser presumes that squid access logs are being logged to system syslog rather than being collected as a custom log source.
 // 3. This parser does not parse every field in the squid access logs but instead parsers those fields most applicable to security analysis
+// 4. This query parser the default squid log format is being used.
 //
 // Usage Instruction : 
 // Paste below query in log analytics, click on Save button and select as Function from drop down by specifying function name and alias (e.g. squid_parser).