Update release notes format (#6100)

* Update release notes

* Update release notes

* Update .NET 6 releae notes

* Update table

* Update links

* Update release table

* Update 2.1

* Update table

* Update links

* Add linux packages doc

* Add link to packages doc

* Update Arch instructions

* Add statement about globalization invariant mode

* Apply suggestions from code review

Co-authored-by: Michael Simons <msimons@microsoft.com>
Co-authored-by: Matt Thalman <mthalman@microsoft.com>

* Update per feedback

* Update link

* Add buster

* Update heading

* Cleanup wording

* Update per feedback

* Update per feedback

* Apply suggestions from code review

Co-authored-by: Maira Wenzel <mairaw@microsoft.com>

* Update perf feedback

* Update release-policies.md

Co-authored-by: Maira Wenzel <mairaw@microsoft.com>

Co-authored-by: Michael Simons <msimons@microsoft.com>
Co-authored-by: Matt Thalman <mthalman@microsoft.com>
Co-authored-by: Maira Wenzel <mairaw@microsoft.com>

release-notes/3.1/3.1-supported-os.md

@@ -1,6 +1,6 @@
 # .NET Core 3.1 - Supported OS versions
 
-The tables below provide OS version information supported by .NET Core 3.1.
+[.NET Core 3.1](README.md) is supported on multiple operating systems per their [lifecycle policy](../../os-lifecycle-policy.md).
 
 ## Keys used in the tables