[Doc][Misc] Comprehensive documentation cleanup and grammatical fixes (#8073)

What this PR does / why we need it?
This pull request performs a comprehensive cleanup of the vLLM Ascend
documentation. It fixes numerous typos, grammatical errors, and phrasing
issues across community guidelines, developer documents, hardware
tutorials, and feature guides. Key improvements include correcting
hardware names (e.g., Atlas 300I), fixing broken links, cleaning up code
examples (removing duplicate flags and trailing commas), and improving
the clarity of technical explanations. These changes are necessary to
ensure the documentation is professional, accurate, and easy for users
to follow.

Does this PR introduce any user-facing change?
No, this PR contains documentation-only updates.

How was this patch tested?
The changes were manually reviewed for accuracy and grammatical
correctness. No functional code changes were introduced.

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Signed-off-by: herizhen <1270637059@qq.com>
Signed-off-by: herizhen <59841270+herizhen@users.noreply.github.com>

docs/source/user_guide/feature_guide/eplb_swift_balancer.md

@@ -83,7 +83,7 @@ vllm serve Qwen/Qwen3-235B-A22 \
 
 3. Model Compatibility:
    - Only MoE models with explicit expert parallelism support (e.g., Qwen3 MoE models) are compatible.
-   - Verify model architecture supports dynamic expert routing through --enable-expert-parallel.
+   - Verify model architecture supports dynamic expert routing through `--enable-expert-parallel`.
 
 4. Monitoring & Validation:
    - Track metrics: expert_load_balance_ratio, ttft_p99, tpot_avg, and gpu_utilization.