fix: close some change requests

Co-authored-by: ZHANG Yuntian <[email protected]>

docs/cmd/rsdk-build.md

@@ -1,14 +1,14 @@
 <!-- cmdrun rsdk build --help -->
 
-## Build Radxa OS image
+## Build RadxaOS image
 
-When no suite or edition options is supplied, `rsdk build` will use the value defined in `src/share/rsdk/configs/products.json`.  
+When no suite or edition options is supplied, `rsdk-build` will use the product-specific default values, which are defined in `src/share/rsdk/configs/products.json` as the first element of the respective array.  
 Using ROCK 3C as an example, if you want to build a cli edition Radxa OS image for Debian bullseye, you can run the following commands.
 
 ```bash
 rsdk build rock-3c bullseye cli
 ```
 
-## Radxa OS image save path
+## RadxaOS output path
 
-you can find Radxa OS image in `out/${product}_${suite}_${edition}/output.img`.
+you can find the generated RadxaOS image as `out/${product}_${suite}_${edition}/output.img`.