Add v0.9.1rc3 release note

Signed-off-by: Shanshan Shen <87969357+shen-shanshan@users.noreply.github.com>

Author: shen-shanshan

docs/source/community/versioning_policy.md

@@ -24,7 +24,8 @@ Following is the Release Compatibility Matrix for vLLM Ascend Plugin:
 |-------------|--------------|------------------|-------------|--------------------|--------------|
 | v0.10.0rc1  | v0.10.0      | >= 3.9, < 3.12   | 8.2.RC1     | 2.7.1 / 2.7.1.dev20250724            |              |
 | v0.9.2rc1   | v0.9.2       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1.post1.dev20250619      |              |
-| v0.9.1rc2   | v0.9.1       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1.post1|              |
+| v0.9.1rc3   | v0.9.1       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1.post1 |              |
+| v0.9.1rc2   | v0.9.1       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1.post1 |              |
 | v0.9.1rc1   | v0.9.1       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1.post1.dev20250528      |              |
 | v0.9.0rc2   | v0.9.0       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1      |              |
 | v0.9.0rc1   | v0.9.0       | >= 3.9, < 3.12   | 8.1.RC1     | 2.5.1 / 2.5.1      |              |
@@ -39,6 +40,7 @@ Following is the Release Compatibility Matrix for vLLM Ascend Plugin:
 
 | Date       | Event                                     |
 |------------|-------------------------------------------|
+| 2025.08.20 | Release candidates, v0.9.1rc3             |
 | 2025.08.04 | Release candidates, v0.9.1rc2             |
 | 2025.07.11 | Release candidates, v0.9.2rc1             |
 | 2025.06.22 | Release candidates, v0.9.1rc1             |

docs/source/user_guide/release_notes.md

@@ -1,5 +1,37 @@
 # Release note
 
+## v0.9.1rc3 - 2025.08.20
+
+This is the 3nd release candidate of v0.9.1 for vLLM Ascend. Please follow the [official doc](https://vllm-ascend.readthedocs.io/en/v0.9.1-dev/) to get started.
+
+### Highlights
+
+...
+
+### Models improvement
+
+...
+
+### Graph mode improvement
+
+...
+
+### Ops improvement
+
+...
+
+### Core
+
+...
+
+### Docs
+
+...
+
+### Known Issues
+
+...
+
 ## v0.10.0rc1 - 2025.08.07
 
 This is the 1st release candidate of v0.10.0 for vLLM Ascend. Please follow the [official doc](https://vllm-ascend.readthedocs.io/en/) to get started. V0 is completely removed from this version.