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

Co-authored-by: Alex Krawiec <alex.krawiec@sentry.io>

Author: codyde

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

@@ -39,7 +39,7 @@ if (span) {
 
 When adding metrics as span attributes:
 
-- Use consistent naming conventions (e.g., `category.metric_name`)
+- Use consistent naming conventions (for example, `category.metric_name`)
 - Keep attribute names concise but descriptive
 - Use appropriate data types (string, number, boolean, or arrays of these types)