Update messages/retrieve.start.md

Co-authored-by: Juliet Shackell <[email protected]>

messages/retrieve.start.md

@@ -107,7 +107,7 @@ Package names to retrieve. Use of this flag is for reference only; don't use it
 
 # flags.package-name.description
 
-The metadata of the supplied package name(s) will be retrieved into a child directory of the project. The name of that child directory matches the name of the package. The retrieved metadata is meant for reference only and should not be added to a source control system for development and deployment. For package development the metadata should be retrieved using a manifest or by targeting a source controlled package directory within your project.
+The metadata of the supplied package name(s) will be retrieved into a child directory of the project. The name of that child directory matches the name of the package. The retrieved metadata is meant for your reference only, don't add it to a source control system for development and deployment. For package development, retrieve the metadata using a manifest (`--manifest` flag) or by targeting a source controlled package directory within your project (`--source-dir` flag).
 
 # flags.source-dir.summary