Update AWS SQS event docs regarding FIFO queue trigger for Lambda

[faheel]

What did you implement

Update SQS event docs regarding AWS support for triggering a Lambda function from an SQS FIFO queue.

Closes #7023

How can we verify it

See AWS documentation for SQS.

Todos

None.

Useful Scripts

• npm run test-ci --> Run all validation checks on proposed changes
• npm run lint-updated --> Lint all the updated files
• npm run lint:fix --> Automatically fix lint problems (if possible)
• npm run prettier-check-updated --> Check if updated files adhere to Prettier config
• npm run prettify-updated --> Prettify all the updated files

• Write and run all tests
• Write documentation
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov-io]

Codecov Report

Merging #7029 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7029   +/-   ##
=======================================
  Coverage   88.48%   88.48%           
=======================================
  Files         229      229           
  Lines        8418     8418           
=======================================
  Hits         7449     7449           
  Misses        969      969

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[medikoo]

Thank you @faheel

[thetumper]

With AWS now supporting FIFO queues as event sources, is serverless also already supporting that?

[faheel]

@thetumper Yes, Serverless already supports this since it never imposed this restriction - it was a feature missing from AWS. I'm currently using it in production and it works flawlessly!