Docs: Updated executor manager prerequisites (#11978)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

Author: writinwaters

docs/develop/migrate_to_single_bucket_mode.md

@@ -1,5 +1,4 @@
 
-
 ---
 sidebar_position: 20
 slug: /migrate_to_single_bucket_mode

docs/guides/agent/agent_component_reference/code.mdx

@@ -130,11 +130,11 @@ docker pull infiniflow/sandbox-base-python:latest
 
 **Root cause**
 
-The executor manager image you are running includes Docker CLI 24.x (API 1.43) while the host Docker daemon now requires API 1.44+ (e.g., Docker 25+ / 29.x).
+Your executor manager image includes Docker CLI 24.x (API 1.43), but the host Docker daemon, e.g., Docker 25+ / 29.x, now requires API 1.44+.
 
 **Solution**
 
-Pull the refreshed image or rebuild locally so the embedded Docker client is new enough:
+Pull the latest executor manager image or rebuild it locally to upgrade the built-in Docker client:
 
 ```bash
 docker pull infiniflow/sandbox-executor-manager:latest

docs/guides/agent/sandbox_quickstart.md

@@ -23,12 +23,14 @@ The architecture consists of isolated Docker base images for each supported lang
 
 - Linux distribution compatible with gVisor.
 - gVisor installed and configured.
-- Docker version 25.0 or higher (API 1.44+). The executor manager image now ships Docker CLI `29.1.0` to stay compatible with newer Docker daemons.
+- Docker version 25.0 or higher (API 1.44+). Ensure your executor manager image ships with Docker CLI `29.1.0` or higher to stay compatible with the latest Docker daemons.
 - Docker Compose version 2.26.1 or higher (similar to RAGFlow requirements).
 - uv package and project manager installed.
 - (Optional) GNU Make for simplified command-line management.
 
-> **Note:** If you see `client version 1.43 is too old. Minimum supported API version is 1.44`, pull the latest `infiniflow/sandbox-executor-manager:latest` from Docker Hub (or rebuild `./sandbox/executor_manager`). Older images embedded Docker 24.x, which cannot talk to upgraded Docker daemons.
+:::tip NOTE
+The error message `client version 1.43 is too old. Minimum supported API version is 1.44` indicates that your executor manager image's built-in Docker CLI version is lower than `29.1.0` required by the Docker daemon in use. To solve this issue, pull the latest `infiniflow/sandbox-executor-manager:latest` from Docker Hub (or rebuild `./sandbox/executor_manager`).
+:::
 
 ## Build Docker base images