Doc: Fault tolerance table

Documentation/v2/admin_guide.md

@@ -113,7 +113,8 @@ It is recommended to have an odd number of members in a cluster. Having an odd c
 | Cluster Size | Majority   | Failure Tolerance |
 |--------------|------------|-------------------|
 | 1 | 1 | 0 |
-| 3 | 2 | 1 |
+| 2 | 2 | 0 |
+| 3 | 2 | **1** |
 | 4 | 3 | 1 |
 | 5 | 3 | **2** |
 | 6 | 4 | 2 |