[8.x] Fix typo in documentation (elastic#204814) (elastic#204850)

# Backport

This will backport the following commits from `main` to `8.x`:
- [Fix typo in documentation
(elastic#204814)](elastic#204814)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: Katerina <[email protected]>

dev_docs/tutorials/performance/adding_custom_performance_metrics.mdx

@@ -298,7 +298,7 @@ This event will be indexed with the following structure:
 
 The meta field supports telemetry on time ranges, providing calculated metrics for enhanced context. This includes:
 
-- **Query range in ceconds:**
+- **Query range in seconds:**
 
   - Calculated as the time difference in seconds between `rangeFrom` and `rangeTo`.