docs: fix examples in tutorial and api gw handler

[michaelbrewer]

What were you initially searching for in the docs?

• Working code examples.

Is this related to an existing part of the documentation? Please share a link

• api gw handler (https://awslabs.github.io/aws-lambda-powertools-python/latest/core/event_handler/api_gateway/)
• appsync handler (https://awslabs.github.io/aws-lambda-powertools-python/latest/core/event_handler/appsync/)
• tutorials (https://awslabs.github.io/aws-lambda-powertools-python/latest/tutorial/)
• feature flag (https://awslabs.github.io/aws-lambda-powertools-python/latest/utilities/feature_flags/)

Describe how we could make it clearer

• Fix code examples

If you have a proposed update, please share it here

List of things to fix:

• fix line number highlights
• fix missing imports
• fix syntax error
• fix indents
• fix example code rendering

Indent issue example:

Syntax Error example:

Missing import example for json example:

Code rendering example:

PR:

• docs: fix syntax errors and line highlights #1004

[heitorlessa]

now available as part of 1.25.0 release

[github-actions]

This is now released under 1.25.10 version!