GA 2.0 release notes (dotnet#605)

Release Notes for 2.0.0-preview4 release (dotnet#572)

[Release 1.1] Release notes for Microsoft.Data.SqlClient v1.1.3 (dotn…

…et#566)

Release Notes for v2.0.0-preview3 (dotnet#549)

[Release 1.1] Update release notes for v1.1.2 (dotnet#526)

Update release notes for 2.0.0-preview2 version (dotnet#486)

* Release notes for 2.0.0-preview2 version

* Apply suggestions from code review

Co-Authored-By: David Engel <dengel@magnitude.com>
Co-Authored-By: Karina Zhou <v-jizho2@microsoft.com>

Co-authored-by: David Engel <dengel@magnitude.com>
Co-authored-by: Karina Zhou <v-jizho2@microsoft.com>

[Release 1.1] Update Release notes for v1.1.1 (dotnet#430)

Release notes for Preview release v2.0.0-preview1 (dotnet#392)

Release Notes for Microsoft.Data.SqlClient 1.1.0 GA (dotnet#320)