doc: [MUSA] minor changes (#12583)

Signed-off-by: Xiaodong Ye <xiaodong.ye@mthreads.com>

Author: yeahdongcn

ci/README.md

@@ -60,7 +60,7 @@ docker run --privileged -it \
 Inside the container, execute the following commands:
 
 ```bash
-apt update -y && apt install -y cmake git python3.10-venv wget
+apt update -y && apt install -y bc cmake git python3.10-venv time unzip wget
 git config --global --add safe.directory /ws
 GG_BUILD_MUSA=1 bash ./ci/run.sh /ci-results /ci-cache
 ```

docs/build.md

@@ -218,6 +218,7 @@ By default, all supported compute capabilities are enabled. To customize this be
 
 ```bash
 cmake -B build -DGGML_MUSA=ON -DMUSA_ARCHITECTURES="21"
+cmake --build build --config Release
 ```
 
 This configuration enables only compute capability `2.1` (MTT S80) during compilation, which can help reduce compilation time.