change formatting for last testing.TB too

sdk/metric/metricdata/metricdatatest/assertion.go

@@ -55,7 +55,7 @@ type Datatypes interface {
 // TestingT is an interface that implements [testing.T], but without the
 // private method of [testing.TB], so other testing packages can rely on it as
 // well.
-// The methods in this interface must match the `testing.TB` interface.
+// The methods in this interface must match the [testing.TB] interface.
 type TestingT interface {
 	Helper()
 	// DO NOT CHANGE: any modification will not be backwards compatible and