Docs: Missing {{ end }} blocks in Go template for local Kind install guide

[mickotronic]

Issue description

Section: "Configure external access to Redpanda"

Issue: The kubectl Go template command used to add /etc/hosts mappings is missing two {{end}} closing blocks, causing the command to fail.

The current (broken) command ends with:

...{{ end }}{{ end }}{{ end }}{{ end }}{{ end }}'

There used to be 7 closers, but now there are 5. It was changed as part of this PR:
https://github.com/redpanda-data/docs/pull/1304/changes#diff-81b46a7b72fbeb9d86aef902c2e6fbb8eae9908f015b683fab9734b816aedbb8L468

And running the command with the template as per the docs results in the following error:

template: output:1: unexpected EOF

This can be independently verified using Go text/template to parse:

cat > check_template.go << 'EOF'
package main
import (
    "os"
    "text/template"
)
func main() {
    b, _ := os.ReadFile(os.Args[1])
    _, err := template.New("t").Parse(string(b))
    if err != nil { println("INVALID:", err.Error()); os.Exit(1) }
    println("VALID")
}
EOF

cat > tmpl_broken.txt << 'EOF'
{{ range $_ := .items }}{{ if and (eq .kind "Endpoints") (eq .metadata.name "redpanda-external") }}{{ range $_ := (index .subsets 0).addresses }}{{ $nodeName := .nodeName }}{{ $podName := .targetRef.name }}{{ range $node := $.items }}{{ if and (eq .kind "Node") (eq .metadata.name $nodeName) }}{{ range $_ := .status.addresses }}{{ if eq .type "InternalIP" }}{{ .address }} {{ $podName }}.customredpandadomain.local{{ "\n" }}{{ end }}{{ end }}{{ end }}{{ end }}{{ end }}
EOF

cat > tmpl_fixed.txt << 'EOF'
{{ range $_ := .items }}{{ if and (eq .kind "Endpoints") (eq .metadata.name "redpanda-external") }}{{ range $_ := (index .subsets 0).addresses }}{{ $nodeName := .nodeName }}{{ $podName := .targetRef.name }}{{ range $node := $.items }}{{ if and (eq .kind "Node") (eq .metadata.name $nodeName) }}{{ range $_ := .status.addresses }}{{ if eq .type "InternalIP" }}{{ .address }} {{ $podName }}.customredpandadomain.local{{ "\n" }}{{ end }}{{ end }}{{ end }}{{ end }}{{ end }}{{ end }}{{ end }}
EOF

go run check_template.go tmpl_broken.txt
go run check_template.go tmpl_fixed.txt

You'll notice that the template with the additional closing {{ end }} blocks is parsed correctly.

Updates to existing documentation

https://docs.redpanda.com/streaming/current/deploy/redpanda/kubernetes/local-guide/

Link to Redpanda Slack conversation

No response

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)