Adding missing params to prepdocs.sh

[itmilos]

Purpose

• ...

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

now 
**azd up**
will successfully deploy 

• Test the code

What to Check

Verify that the following are valid

Verify that azd up will deploy service in initial setup

Other Information

For existing service we should double check that everything is working, it seems that we are missing keys in main.parameters.json