Fix the parsers page in 1.7 / 1.8

[agup006]

The parser page is missing in 1.7 and 1.8.

This page is last available in 1.3 documentation

[nokute78]

I sent a patch https://github.com/fluent/fluent-bit-docs/pull/526

Related issue: #514

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This issue was closed because it has been stalled for 5 days with no activity.