Running `hc scaffold collections` removes code comments

[c12i]

Running hc scaffold collections deletes code comments from previously generated rust code in integrity zome

How to reproduce

1. Scaffold web app, name it, select a template of your choice and set up holonix development environment. Cd into the project and run nix develop

nix run github:/holochain/holochain#hc-scaffold -- web-app

2. Scaffold a dna

hc scaffold dna

3. Scaffold a zome

hc scaffold zome

4. Scaffold an entry type

hc scaffold entry-type

5. Commit changes via git to visualize deleted comments via git diff

git add .
git commit -m "Initial commit"

7. Scaffold a collection

hc scaffold collection

8. Observe diff, the integrity zome's code will show comments initially scaffolded in previous stages are now deleted. Specifically on the validate_create_link_<name>_updates function