Adding better clarity on custom span vs adding attributes

Author: codyde

docs/platforms/javascript/common/tracing/span-metrics/index.mdx

@@ -46,7 +46,7 @@ When adding metrics as span attributes:
 
 ## Creating Dedicated Metric Spans
 
-For more detailed metric tracking, you can create dedicated spans that focus on specific metrics. This approach provides better organization and more precise timing data.
+For more detailed transaction tracking, you can create custom dedicated spans that focus on specific metrics or attributes that you want to track. This approach provides better discoverability and more precise span configurations, however it can also appear to create more noise in your transaction traces.
 
 ```javascript
 Sentry.startSpan(