Update src/data/markdown/docs/03 cloud/02 Analyzing Results/02 Performance Insights.md

Co-authored-by: Heitor Tashiro Sergent <[email protected]>

Author: ckbedwell

src/data/markdown/docs/03 cloud/02 Analyzing Results/02 Performance Insights.md

@@ -257,7 +257,7 @@ _Identifier_: `best_practice_invalid_metric_names`
   you tag your custom metrics with invalid names.
 - **Recommendations**:
   - Ensure your custom metric names comply with OpenTelemetry and Prometheus limitations. Such as:
-    - they only contain valid symbols of ASCII letters, numbers, or `_`.
+    - Only contain valid symbols of ASCII letters, numbers, or `_`.
     - Metric names must not start with a number.
 
 ## Health alerts