Doc: Fix plugin codec settings in generated output

[karenzone]

Follow-up to #16441. Update generated content for current files that can't be updated programmatically.

After PRs to fix codec issues were merged, I generated updated plugins for:

• main: updated docs for main logstash-docs#1723
• 8.x: updated docs for 8.x logstash-docs#1724
• 8..15: Updates held out by lockfile. Manual fix: updated docs for 8.15 - fix codec attribute logstash-docs#1729
• 7.17: No action required. Affected plugins weren't available at 7.17.

Merged PRs to fix plugins for Versioned Plugin Reference:

• auto generated update of versioned plugin documentation logstash-docs#1722
• auto generated update of versioned plugin documentation logstash-docs#1725

ToDo:

• Update previous versions in VPR to resolve attribute spillover issue: Update versioned plugin documentation for codec values logstash-docs#1727
  • input-elastic_serverless_forwarder
  • input-logstash
  • output-logstash