[main][Docs] Fix spelling errors across documentation (#6649)

Fix various spelling mistakes in the project documentation to improve
clarity and correctness.
- vLLM version: v0.15.0
- vLLM main:
d7e17aaacd

---------

Signed-off-by: SlightwindSec <slightwindsec@gmail.com>

docs/source/community/versioning_policy.md

@@ -141,7 +141,7 @@ Usually, each minor version of vLLM (such as 0.7) corresponds to a vLLM Ascend v
 
 ### Backward compatibility
 
-For main branch, vLLM Ascend should works with vLLM main branch and latest 1 or 2 releases. To ensure backward compatibility, do as follows:
+For main branch, vLLM Ascend should work with vLLM main branch and latest 1 or 2 releases. To ensure backward compatibility, do as follows:
 
 - Both main branch and target vLLM release, such as the vLLM main branch and vLLM 0.8.4, are tested by Ascend E2E CI.
 - To make sure that code changes are compatible with the latest 1 or 2 vLLM releases, vLLM Ascend introduces a version check mechanism inside the code. It checks the version of the installed vLLM package first to decide which code logic to use. If users hit the `InvalidVersion` error, it may indicate that they have installed a dev or editable version of vLLM package. In this case, we provide the env variable `VLLM_VERSION` to let users specify the version of vLLM package to use.