minor bug fix and refs update in Notifications tests

SOL002/VNFIndicator-API/VNFIndicators.robot

@@ -286,7 +286,7 @@ Check HTTP Response Header Contains
     
 Check HTTP Response Body Json Schema Is
     [Arguments]    ${schema}
-    Run Keyword If    '${input}' == 'ProblemDetails'    Should Contain    ${response['headers']['Content-Type']}    application/problem+json
+    Run Keyword If    '${schema}' == 'ProblemDetails'    Should Contain    ${response['headers']['Content-Type']}    application/problem+json
     ...    ELSE    Should Contain    ${response['headers']['Content-Type']}    application/json
     ${jsonSchema}=    Catenate    SEPARATOR=    ${schema}    .schema.json
     Validate Json    ${jsonSchema}    ${response['body']}

SOL002/VNFIndicatorNotification-API/Notifications.robot

@@ -16,7 +16,7 @@ VNF Indicator Value Change Notification
     ...    Test title: VNF Indicator Value Change Notification
     ...    Test objective: The objective is to test the dispatch of VNF Indicator Value Change Notification when new indicator values are available in the VNF, and perform a JSON schema and content validation of the delivered notification. The action that triggers the notification under test is an explicit test step, but it is not performed by the test system.
     ...    Pre-conditions: A VNF is instantiated, and a subscription for indicator value change notifications is available in the VNF.
-    ...    Reference: Clause 8.4.7.3.1 - ETSI GS NFV-SOL 002 [2] v3.3.1
+    ...    Reference: Clause 8.4.7.3.1 - ETSI GS NFV-SOL 002 [2] v3.6.1
     ...    Config ID: Config_prod_VNF
     ...    Applicability: none
     ...    Post-Conditions: none 
@@ -29,7 +29,7 @@ Supported Indicators Change Notification
     ...    Test title: Supported Indicators Change Notification
     ...    Test objective: The objective is to test the dispatch of Supported Indicators Change Notification when new indicator values are available in the VNF, and perform a JSON schema and content validation of the delivered notification. The action that triggers the notification under test is an explicit test step, but it is not performed by the test system.
     ...    Pre-conditions: A VNF is instantiated, and a subscription for supported indicators change notifications is available in the VNF.
-    ...    Reference: Clause 8.4.7.3.1 - ETSI GS NFV-SOL 002 [2] v3.3.1
+    ...    Reference: Clause 8.4.7.3.1 - ETSI GS NFV-SOL 002 [2] v3.6.1
     ...    Config ID: Config_prod_VNF
     ...    Applicability: none
     ...    Post-Conditions: none