chore: add docs reminder comments for driver opts

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

driver/remote/driver.go

@@ -14,6 +14,9 @@ import (
 type Driver struct {
 	factory driver.Factory
 	driver.InitConfig
+
+	// if you add fields, remember to update docs:
+	// https://github.com/docker/docs/blob/main/content/build/drivers/remote.md
 	*tlsOpts
 }