docs(samples): fix checkstyle errors

[pmakani]

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #681

[codecov]

Codecov Report

Merging #682 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #682 +/- ## ========================================= Coverage 81.49% 81.49% Complexity 1226 1226 ========================================= Files 77 77 Lines 6220 6220 Branches 691 691 ========================================= Hits 5069 5069 Misses 792 792 Partials 359 359 

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