chore: [release-3.0.x] docs: update _index.md to reflect config file name and location change #13401
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Backport c694953 from #13390
What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Checklist
CONTRIBUTING.md
guide (required)feat
PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.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