release note and announcement for 1.3.2/1.1.16/1.2.7

[linsun]

Please provide a description for what this PR is for.

And to help us figure out who should review this PR, please
put an X in all the areas that this PR affects.

[ ] Configuration Infrastructure
[x ] Docs
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Policies and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience
[ ] Developer Infrastructure

[istio-testing]

@linsun: PR needs rebase.

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[googlebot]

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[istio-testing]

@linsun: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
lint_istio.io	9555168	link	/test lint_istio.io
lint_istio.io_release-1.3	9555168	link	/test lint_istio.io_release-1.3

Details

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[liminw]

/lgtm

[linsun]

not sure why lint failed, will play with it in #5106