Revise gNMI-3.7 test cases for clarity and accuracy

[dplore]

Updated test cases for gNMI-3.7 to clarify invalid configurations and their handling in CLI and OC. Removed outdated examples and added new scenarios for MTU configuration errors.

[gemini-code-assist]

Summary of Changes

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This pull request refines the documentation and test scenarios for gNMI-3.7, focusing on improving the clarity of invalid configuration handling. By replacing ambiguous reference validation errors with concrete MTU configuration examples, the changes ensure that test cases are more representative of real-world validation failures.

Highlights

• Documentation Update: Updated the gNMI-3.7 test case documentation to remove outdated references and clarify error scenarios.
• Test Scenario Refinement: Replaced generic BGP policy and QoS queue reference errors with specific MTU configuration errors for non-existent interfaces to improve test accuracy.

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[OpenConfigBot]

Pull Request Functional Test Report for #5498 / 868a60a

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		gNMI-3: union_replace	d09ab7d6	Log
Cisco 8000E		gNMI-3: union_replace	ccf99867	Log
Cisco XRd		gNMI-3: union_replace	b37b9b73	Log
Juniper ncPTX		gNMI-3: union_replace	0bed1332	Log
Nokia SR Linux		gNMI-3: union_replace	edcb1bc2	Log
Openconfig Lemming		gNMI-3: union_replace	c6450092	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		gNMI-3: union_replace
Cisco 8808		gNMI-3: union_replace
Juniper PTX10008		gNMI-3: union_replace
Nokia 7250 IXR-10e		gNMI-3: union_replace

Help

[gemini-code-assist]

Code Review

This pull request updates the union_replace_test documentation by simplifying the error scenarios to use MTU configuration for non-existent interfaces instead of BGP or QoS policies. Feedback was provided to fix an incomplete sentence, correct spelling errors, and resolve an inconsistency between a section header and its description.

[dplore]

I decided to include these changes in #5451