cmd/getgo: have consistent messages

Currently, we output:

The latest go version is go1.8.3, install that? Y/n [Y]: Y
Download go version go1.8.3 to /Users/jbd/.go? Y/n [Y]: Y

Change-Id: I4fa72f2066259b75d3349487dae5bdced9fdd8a2
Reviewed-on: https://go-review.googlesource.com/51910
Reviewed-by: Chris Broadfoot <cbro@golang.org>
diff --git a/cmd/getgo/steps.go b/cmd/getgo/steps.go
index ad65d45..b23f1b7 100644
--- a/cmd/getgo/steps.go
+++ b/cmd/getgo/steps.go
@@ -43,7 +43,7 @@
 		return err
 	}
 
-	answer, err := prompt(ctx, fmt.Sprintf("The latest go version is %s, install that? Y/n", *goVersion), "Y")
+	answer, err := prompt(ctx, fmt.Sprintf("The latest Go version is %s, install that? Y/n", *goVersion), "Y")
 	if err != nil {
 		return err
 	}
@@ -58,7 +58,7 @@
 }
 
 func downloadGo(ctx context.Context) error {
-	answer, err := prompt(ctx, fmt.Sprintf("Download go version %s to %s? Y/n", *goVersion, installPath), "Y")
+	answer, err := prompt(ctx, fmt.Sprintf("Download Go version %s to %s? Y/n", *goVersion, installPath), "Y")
 	if err != nil {
 		return err
 	}