contrib/cmd/hiveutil/awstagdeprovision: Add long description

Explaining how multiple tag values interact.

Also fix the usage instructions to show that one KEY=VALUE argument is
required and more are optional, as documented in the SYNOPSIS section
of [1].

[1]: http://man7.org/linux/man-pages/man7/man-pages.7.html#DESCRIPTION

contrib/cmd/hiveutil/awstagdeprovision.go

@@ -32,8 +32,9 @@ func NewDeprovisionAWSWithTagsCommand() *cobra.Command {
  opt := &awstagdeprovision.ClusterUninstaller{}
  opt.Filters = awstagdeprovision.AWSFilter{}
  cmd := &cobra.Command{
- Use: "aws-tag-deprovision key=value",
- Short: "Deprovision AWS assets (as created by openshift-installer) with a given tag",
+ Use: "aws-tag-deprovision KEY=VALUE ...",
+ Short: "Deprovision AWS assets (as created by openshift-installer) with the given tag(s)",
+ Long: "Deprovision AWS assets (as created by openshift-installer) with the given tag(s). A resource matches the filter if all of the key/value pairs are in its tags.",
  Run: func(cmd *cobra.Command, args []string) {
  if err := completeAWSUninstaller(opt, args); err != nil {
  log.WithError(err).Error("Cannot complete command")