[SVE] TC-DGGEN-2.1 inconsistency with test plan

From chip-test-scripts created by ericzijian1994: CHIP-Specifications/chip-test-scripts#667

Description:

In TC-DGGEN-2.1, the scripts and test plan with eventTrigger are inconsistent. And the DUT no longer requires step 9c to trigger an unknown function.

    - label:
          "Step 9c: When configured TRUE, Node has been configured with one or
          more test event triggers by virtue of the internally programmed non
          zero EnableKey value"
      runIf: IsExpectedValue
      PICS: DGGEN.S.C00.Rsp
      command: "TestEventTrigger"
      arguments:
          values:
              - name: "EnableKey"
                value: TEST_EVENT_ENABLE_KEY
              - name: "EventTrigger"
                value: TEST_EVENT_TRIGGER_KEY

In addition, the script has some descriptive errors at line 479: Step 10c should be Step 10d

Steps to reproduce:

./chip-tool generaldiagnostics test-event-trigger hex:00112233445566778899aabbccddeeff 0x0000000000000003 1 0

Additional Info:

Test plan: general_diagnostics.adoc