build: reformat comments to pass go1.19 vet

See: https://go.dev/doc/go1.19#go-doc

backend/qingstor/qingstor.go

@@ -431,9 +431,9 @@ func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options .
 
 // Copy src to this remote using server-side copy operations.
 //
-// This is stored with the remote path given
+// This is stored with the remote path given.
 //
-// It returns the destination Object and a possible error
+// It returns the destination Object and a possible error.
 //
 // Will only be called if src.Fs().Name() == f.Name()
 //
@@ -477,7 +477,7 @@ func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
 
 // Return an Object from a path
 //
-//If it can't be found it returns the error ErrorObjectNotFound.
+// If it can't be found it returns the error ErrorObjectNotFound.
 func (f *Fs) newObjectWithInfo(remote string, info *qs.KeyType) (fs.Object, error) {
 	o := &Object{
 		fs:     f,