TBR: Remove scary "WARNING" text, since the behavior is expected.

Multiple people have been confused by this.

Fix https://github.com/vanadium/issues/issues/951

PresubmitTest: none
Change-Id: I66b47f9a78af8fded62bc866258c495b19b734a7
diff --git a/profiles/manifest.go b/profiles/manifest.go
index 02395ab..b044124 100644
--- a/profiles/manifest.go
+++ b/profiles/manifest.go
@@ -245,7 +245,7 @@
 	data, err := jirix.Run().ReadFile(filename)
 	if err != nil {
 		if os.IsNotExist(err) {
-			fmt.Fprintf(jirix.Stderr(), "WARNING: %v doesn't exist\n", filename)
+			fmt.Fprintf(jirix.Stderr(), "creating %v\n", filename)
 			return nil
 		}
 		return err