Clarify on JSONRPC format

[anthony-c-martin]

Addresses some ambiguity raised under #13824

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 8605448721)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 8605448721

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 8605448721"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 8605448721

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 8605448721"

[github-actions]

Test Results

    66 files   -     33      66 suites   - 33   22m 40s ⏱️ - 20m 40s
10 744 tests  -     20  10 743 ✅  -     20  1 💤 ±0  0 ❌ ±0 
25 384 runs   - 12 688  25 382 ✅  - 12 687  2 💤  - 1  0 ❌ ±0 

Results for commit 230f93b. ± Comparison against base commit 096c32f.