Update docs/platforms/python/tracing/instrumentation/index.mdx

Co-authored-by: Daniel Szoke <[email protected]>

Author: sfanahata

docs/platforms/python/tracing/instrumentation/index.mdx

@@ -16,6 +16,6 @@ There are two ways that instrumentation is applied to your application:
 
 Many integrations for popular framewo that can be sent to Sentry. Read more about automatic instrumentation [here](/platforms/python/tracing/instrumentation/automatic-instrumentation/).
 
-## 2. Custom Instrumentation
+## Custom Instrumentation
 To add custom performance data to your application, you need to add custom instrumentation in the form of [spans](/concepts/key-terms/tracing/distributed-tracing/#traces-transactions-and-spans). Spans are a way to measure the time it takes for a specific action to occur. For example, you can create a span to measure the time it takes for a function to execute. Learn more about span lifecycles [here](/platforms/python/tracing/span-lifecycle/).