Add Illumos (a Linux distro) to known words list (Azure#24614)

Author: Mohit-Chakraborty

.vscode/cspell.json

@@ -33,7 +33,6 @@
     "sdk/agrifood/*/api/*.cs",
     "sdk/communication/*/api/*.cs",
     "sdk/compute/*/api/*.cs",
-    "sdk/containerregistry/*/api/*.cs",
     "sdk/cosmosdb/*/api/*.cs",
     "sdk/digitaltwins/*/api/*.cs",
     "sdk/dns/*/api/*.cs",
@@ -67,6 +66,7 @@
     "expando",
     "finalizer",
     "finalizers",
+    "illumos",
     "ints",
     "lucene",
     "mgmt",