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Add explict syntax for using `pattern` parser (#3871)

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* Add explict syntax for using `pattern` parser

Motivation is from community discussion
https://community.grafana.com/t/how-to-use-loki-pattern-parser/49195

* Update docs/sources/logql/_index.md

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>
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Kaviraj 5 years ago committed by GitHub
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      docs/sources/logql/_index.md

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docs/sources/logql/_index.md
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@ -280,7 +280,7 @@ will get those labels extracted:
##### Pattern
The pattern parser allows the explicit extraction of fields from log lines by defining a pattern expression. The expression matches the structure of a log line.
The pattern parser allows the explicit extraction of fields from log lines by defining a pattern expression (`| pattern "<pattern-expression>"`). The expression matches the structure of a log line.
Consider this NGINX log line.

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