Add docs for include_source_context

Author: sentrivana

src/platforms/python/common/data-collected.mdx

@@ -52,6 +52,12 @@ The request body of incoming HTTP requests can be sent to Sentry. Whether it's s
 
 If you want to prevent bodies from being sent to Sentry altogether, set `request_bodies` to `"never"`.
 
+## Source Context
+
+When an unhandled exception is sent to Sentry, a snapshot of the source code surrounding the place where the error originates is sent with it.
+
+To opt out of sending source context to Sentry, set `include_source_context` to `False`.
+
 ## Local Variables In Stack Trace
 
 When unhandled errors and exceptions are sent to Sentry, the names and values of local variables that were set when the errors occurred, are sent at the same time.