[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.

---------

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

docs/source/developer_guide/evaluation/using_opencompass.md

@@ -4,7 +4,7 @@ This document guides you to conduct accuracy testing using [OpenCompass](https:/
 
 ## 1. Online Server
 
-You can run docker container to start the vLLM server on a single NPU:
+You can run a docker container to start the vLLM server on a single NPU:
 
 ```{code-block} bash
    :substitutions:
@@ -116,7 +116,7 @@ python3 run.py opencompass/configs/eval_vllm_ascend_demo.py --debug
 After 1 to 2 minutes, the output is shown below:
 
 ```shell
-The markdown format results is as below:
+The markdown format results are as below:
 
 | dataset | version | metric | mode | Qwen2.5-7B-Instruct-vLLM-API |
 |----- | ----- | ----- | ----- | -----|