docs: bring new feature upfront when returning sensitive info

Author: heitorlessa

docs/content/core/tracer.mdx

@@ -17,6 +17,12 @@ Tracer is an opinionated thin wrapper for [AWS X-Ray Python SDK](https://github.
 * Support tracing async methods, generators, and context managers
 * Auto patch supported modules, or a tuple of explicit modules supported by AWS X-Ray
 
+<Note type="warning">
+  <strong>Returning sensitive information from your Lambda handler or functions, where Tracer is used?</strong>
+  <br/><br/>
+  You can disable capturing their responses as tracing metadata with <strong><code>capture_response=False</code></strong> parameter for both capture_lambda_handler and capture_method decorators.
+</Note><br/>
+
 ## Initialization
 
 Your AWS Lambda function must have permission to send traces to AWS X-Ray - Here is an example using AWS Serverless Application Model (SAM)
@@ -63,6 +69,10 @@ def handler(event, context):
     charge_id = event.get('charge_id')
     payment = collect_payment(charge_id)
     ...
+
+@tracer.capture_lambda_handler(capture_response=False) # highlight-line
+def handler(event, context):
+	return "sensitive_information"
 ```
 
 ### Annotations
@@ -108,7 +118,10 @@ def collect_payment(charge_id):
     ret = requests.post(PAYMENT_ENDPOINT) # logic
     tracer.put_annotation("PAYMENT_STATUS", "SUCCESS") # custom annotation
     return ret
-...
+
+@tracer.capture_method(capture_response=False) # highlight-line
+def sensitive_information_to_be_processed():
+	return "sensitive_information"
 ```
 
 ## Asynchronous and generator functions