adjust position of principalType (#3252)

Signed-off-by: Hayden-Chang <shenshuoyouguang@outlook.com>

docs/snippets/oracle-secret-store.yaml

@@ -33,10 +33,10 @@ spec:
     oracle:
       vault: # The vault OCID
       region: # The vault region
+      principalType: UserPrincipal
       auth:
         user: # A user OCID
         tenancy: # A user's tenancy
-        principalType: UserPrincipal
         secretRef:
           privatekey:
             name: oracle-secret