chore: [release-2.9.x] docs: add labels expressions to categories #12666
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Backport 985251c from #12607
What this PR does / why we need it:
The categories in the log pipeline documentation do not appear to contain labels expressions.
Which issue(s) this PR fixes:
None
Special notes for your reviewer:
Checklist
CONTRIBUTING.md
guide (required)docs/sources/setup/upgrade/_index.md
production/helm/loki/Chart.yaml
and updateproduction/helm/loki/CHANGELOG.md
andproduction/helm/loki/README.md
. Example PRdeprecated-config.yaml
anddeleted-config.yaml
files respectively in thetools/deprecated-config-checker
directory. Example PR