docs: filters: log_to_metrics: general doc updates and cleanup

[eschabell]

• emitter_mem_buf_limit: describe pause/drop behavior on buffer full and how to monitor per-emitter activity via /api/v1/metrics
• label_field: note that each unique label combination creates a separate series; warn about high-cardinality fields
• value_field: clarify it is ignored for counter mode (increments by 1 per matching record), matching cmt_counter_inc behavior in source
• Add a cardinality warning hint below the parameter table

Applies to #2551

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