Update CAPA supported AMI OS

[wyike]

What type of PR is this?
/kind support

What this PR does / why we need it:
Recent image-builder has removed support on ubuntu1804 in recent releases: here.
CAPA in the meanwhile follows the same, starts to support ubuntu2204 ami and drop support on ubuntu1804 ami. When listing amis with clusterawsadm, add ubuntu2204 filter to include ubuntu2204 to the list result.
In this PR, it also fixes a typo on a duplicate region ap-northeast-2 on the doc

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

build clusterawsadm and test locally:

clusterawsadm ami list --kubernetes-version=v1.28.2 --region=ap-southeast-2
KUBERNETES VERSION   REGION           OS               NAME                                         AMI ID
v1.28.2              ap-southeast-2   centos-7         capa-ami-centos-7-v1.28.2-1698240556         ami-04d09efb987ba6e39
v1.28.2              ap-southeast-2   ubuntu-22.04     capa-ami-ubuntu-22.04-v1.28.2-1698245433     ami-037833b5c08755eba
v1.28.2              ap-southeast-2   ubuntu-20.04     capa-ami-ubuntu-20.04-v1.28.2-1698246116     ami-0869d5134668ef6de
v1.28.2              ap-southeast-2   amazon-2         capa-ami-amazon-2-v1.28.2-1698240568         ami-00a9c865ebfb45d52
v1.28.2              ap-southeast-2   flatcar-stable   capa-ami-flatcar-stable-v1.28.2-1698242503   ami-04532cb90a1ddaa8a

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

Update CAPA supported AMI OS: support on ubuntu2204 added, ubuntu1804 dropped

[Ankitasw]

Thanks for the PR @wyike

/lgtm
/approve

[k8s-ci-robot]

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