[NPU] --attn-cp-size --init-expert-location --eplb-algorithm parameter docs update

[Hide-on-bushsh]

Motivation

Modifications

Accuracy Tests

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[gemini-code-assist]

Code Review

This pull request updates the Ascend NPU support features documentation by adding specific constraints and valid values for the --attn-cp-size, --init-expert-location, and --eplb-algorithm arguments. The review feedback focuses on improving documentation clarity and consistency, specifically recommending the use of semicolons for constraints and the removal of angle brackets from literal values to avoid confusion with placeholders.