fix(js): Remove emoji characters causing atob encoding error

Remove ✨ and ❌ emoji characters from code examples that were causing
'InvalidCharacterError: Failed to execute atob' errors in docs.

The atob function only supports Latin1 (ISO-8859-1) characters, and
emojis are outside that range, causing encoding issues during page
rendering.

Author: codyde

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

@@ -51,7 +51,7 @@ Sentry.startSpan(
       const data: { orderId: string; paymentProvider: string } = await response.json()
       span.setAttribute('order.id', data.orderId)
       span.setAttribute('payment.provider', data.paymentProvider)
-      Sentry.logger.info(Sentry.logger.fmt`✨ Order ${data.orderId} confirmed via ${data.paymentProvider}`)
+      Sentry.logger.info(Sentry.logger.fmt`Order ${data.orderId} confirmed via ${data.paymentProvider}`)
 
       // Show order confirmation
       setOrderConfirmation({
@@ -65,7 +65,7 @@ Sentry.startSpan(
       span.setStatus({ code: 2, message: 'internal_error' })
       const errorMessage = err instanceof Error ? err.message : 'Checkout failed'
       setCheckoutError(errorMessage)
-      Sentry.logger.error(Sentry.logger.fmt`❌ ${errorMessage}`)
+      Sentry.logger.error(Sentry.logger.fmt`${errorMessage}`)
     } finally {
       setIsCheckingOut(false)
     }