[TC-DD-2.1] YAML Script has to be updated as per Verification step document

[Ashwinigrl]

Description:

TC-DD-2.1 In script step 7a, 7b has to be updated as per Verification Step step document.

Steps to reproduce:

Test step 7a, 7b

Test plan References:

• https://github.com/CHIP-Specifications/chip-test-plans/blob/master/src/devicediscovery.adoc#321-tc-dd-21-announcement-by-device-verification-dut---commissionee

Verification Step Document References:

https://docs.google.com/spreadsheets/d/13zltSz50GRs_kidvobceEuIT8kAAHSK64ANyWcc3xQI/edit#gid=311763523&range=1:925

Yaml Script References:

• https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/certification/Test_TC_DD_2_1.yaml