update godocs

pkg/assertions/validate.go

@@ -1,3 +1,6 @@
+// Copyright 2022 VMware, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
 package assertions
 
 import (

pkg/assertions/yamlmeta.go

@@ -1,7 +1,11 @@
+// Copyright 2022 VMware, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
 package assertions
 
 import "github.com/vmware-tanzu/carvel-ytt/pkg/yamlmeta"
 
+// AddValidations appends validation Rules to node's validations metadata, later retrieved via GetValidations().
 func AddValidations(node yamlmeta.Node, rules []Rule) {
 	metas := node.GetMeta("validations")
 	if currRules, ok := metas.([]Rule); ok {
@@ -10,10 +14,12 @@ func AddValidations(node yamlmeta.Node, rules []Rule) {
 	SetValidations(node, rules)
 }
 
+// SetValidations attaches validation Rules to node's metadata, later retrieved via GetValidations().
 func SetValidations(node yamlmeta.Node, rules []Rule) {
 	node.SetMeta("validations", rules)
 }
 
+// GetValidations retrieves validation Rules from node metadata, set previously via SetValidations().
 func GetValidations(node yamlmeta.Node) []Rule {
 	metas := node.GetMeta("validations")
 	if rules, ok := metas.([]Rule); ok {