clarify

Author: ghogen

docs/containers/container-build-from-command-line.md

@@ -65,7 +65,7 @@ To view the MSBuild logs, see [Obtaining build logs with MSBuild](../msbuild/obt
 
 ## Command lines
 
-Visual Studio uses a nonstandard command line to produce an image configured to work best for development and debugging, especially if Fast Mode is enabled, so we don't recommend copying the docker build commands from the Output window in a regular build. To build a standard image without nonstandard optimizations you can right-click on the Dockerfile and choose the **Build Docker image** option  You can lift the command lines from the Build tab of the Output window with a few caveats and considerations due to the way Visual Studio builds images.
+Visual Studio uses Fast Mode (if enabled) to produce a container image configured to work best for development and debugging so we don't recommend copying the docker build commands from the Output window in a regular build. To build a standard image without nonstandard optimizations you can right-click on the Dockerfile and choose the **Build Docker image** option  You can lift the command lines from the Build tab of the Output window with a few caveats and considerations due to the way Visual Studio builds images.
 
 Visual Studio uses the `dev` tag to designate images that it has specially prepared to optimize the startup time during debugging. However, these images shouldn't be used outside of the context of Visual Studio. This tag is an indication the images have nonstandard modifications and customizations, for example, to support Fast Mode debugging. See [Customize Docker containers in Visual Studio](container-build.md).