build: tidy error messages

Signed-off-by: CrazyMax <[email protected]>

build/build.go

@@ -1562,25 +1562,19 @@ func waitContextDeps(ctx context.Context, index int, results *waitmap.Map, so *c
 
 func cacheExportNotSupported(d driver.Driver) error {
 	return errors.Errorf(`Cache export is not supported for the %s driver.
-
 Switch to a different driver and try again.
-
 Learn more at https://docs.docker.com/go/build-cache-backends/`, d.Factory().Name())
 }
 
 func exporterNotSupported(d driver.Driver, f driver.Feature) error {
 	return errors.Errorf(`%s is not supported for the %s driver.
-
 Switch to a different driver and try again.
-
 Learn more at https://docs.docker.com/go/build-exporters/`, f, d.Factory().Name())
 }
 
 func multiPlatformBuildNotSupported(d driver.Driver) error {
 	return errors.Errorf(`Multi-platform build is not supported for the %s driver without the containerd image store.
-
 Switch to a different driver, or turn on the containerd image store, and try again.
-
 Learn more at https://docs.docker.com/go/build-multi-platform/`, d.Factory().Name())
 }