Update tech_docs/networking/iac_github_project.md

tech_docs/networking/iac_github_project.md

@@ -4,11 +4,13 @@ It is intentionally abstract (no literal values, no vendor CLI) so it can be mec
 --------------------------------------------------------
 1. Meta-Template Structure
 --------------------------------------------------------
+```plaintext
 ┌─ object: device
 │  ├─ role: head-end-dmvpn-hub
 │  ├─ platform: <vendor-agnostic>
 │  └─ lifecycle: golden-template → instance-template → device-config
 └─
+```
 
 Each stanza below is a YAML-ish block that can be turned into:
 - Jinja2 / Ansible variables