Fix a couple typos

pkg/volume/volume.go

@@ -81,7 +81,7 @@ type Builder interface {
 	// 'fsGroup' so that it can be accessed by the pod. This may
 	// be called more than once, so implementations must be
 	// idempotent.
-	SetUpAt(dir string, sGroup *int64) error
+	SetUpAt(dir string, fsGroup *int64) error
 	// GetAttributes returns the attributes of the builder.
 	GetAttributes() Attributes
 }

third_party/golang/expansion/expand.go

@@ -10,7 +10,7 @@ const (
 	referenceCloser = ')'
 )
 
-// syntaxWrap returns the input string wrapped the expansion syntax.
+// syntaxWrap returns the input string wrapped by the expansion syntax.
 func syntaxWrap(input string) string {
 	return string(operator) + string(referenceOpener) + input + string(referenceCloser)
 }