(DOCSP-44251) [C#] Remove EOL v2.19 & v2.20 from "What's New" for v2.21+#262

elyse-mdb merged 1 commit intomongodb:mastermongodb/docs-csharp:masterfrom

elyse-mdb:DOCSP-44251-EOLv2.20elyse-mdb/docs-csharp:DOCSP-44251-EOLv2.20Copy head branch name to clipboard