Fix incorrect Purity version in DFS support table

Purity 6.5.10 is validated with DFS 2.2.2.

Author: pjw711

articles/operator-nexus/reference-near-edge-storage-supported-versions.md

@@ -101,7 +101,7 @@ Azure Operator Nexus supports and tests the latest combination of a Purity versi
 
 | PurityOS Version | DFS Version|
 |------------------|------------|
-| 6.5.10            | 2.2.1     |
+| 6.5.10            | 2.2.2     |
 
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