fix: add a note to specify mainnet optimization

[darrenvechain]

Description

Add thor.yaml notes for examples

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing E2E tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.78%. Comparing base (aedfc6b) to head (53eed04). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #746 +/- ## ========================================== + Coverage 61.77% 61.78% +0.01% ========================================== Files 195 196 +1 Lines 18246 18272 +26 ========================================== + Hits 11271 11290 +19 - Misses 5876 5880 +4 - Partials 1099 1102 +3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.