Docs: update split_queries_by_interval documentation to have the co…

…rrect explanation for how to disable. (#6715)

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**What this PR does / why we need it**:
I noticed when responding to #5123 the docs did not correctly explain how to disable splitting queries by time. I searched through the code and confirmed `0` is the correct value to disable this feature

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

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**Checklist**
- [ ] Documentation added
- [ ] Tests updated
- [ ] Is this an important fix or new feature? Add an entry in the `CHANGELOG.md`.
- [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md`

Signed-off-by: Edward Welch <edward.welch@grafana.com>
Co-authored-by: Karen Miller <84039272+KMiller-Grafana@users.noreply.github.com>

docs/sources/configuration/_index.md

@@ -2467,7 +2467,7 @@ The `limits_config` block configures global and per-tenant limits in Loki.
 # CLI flag: -frontend.min-sharding-lookback
 [min_sharding_lookback: <duration> | default = 0s]
 
-# Split queries by an interval and execute in parallel, any value less than zero disables it.
+# Split queries by a time interval and execute in parallel. The value 0 disables splitting by time.
 # This also determines how cache keys are chosen when result caching is enabled
 # CLI flag: -querier.split-queries-by-interval
 [split_queries_by_interval: <duration> | default = 30m]