Fixing straightforward configuration snippets (Part 2)

[davidalber]

This is the second -- and final -- batch of straightforward configuration snippet fixes for #1845. See #2369 for the first batch.

As in the previous PR, the fixes use a few approaches. Most commonly, snippets are wrapped in a function and lines are made longer to reach the default max width, which often triggers formatting.

This batch corrects sixteen configuration snippets, as can be seen with cargo test -- --ignored. Here is the output on master:

---- configuration_snippet_tests stdout ----
        Ran 104 configurations tests.
thread 'configuration_snippet_tests' panicked at 'assertion failed: `(left == right)`
  left: `22`,
 right: `0`: 22 configurations tests failed', tests/system.rs:800:5

Here is the output on the PR branch:

---- configuration_snippet_tests stdout ----
        Ran 104 configurations tests.
thread 'configuration_snippet_tests' panicked at 'assertion failed: `(left == right)`
  left: `6`,
 right: `0`: 6 configurations tests failed', tests/system.rs:800:5

The fixes for the remaining six failing cases will be more involved or require more discussion, so they will arrive in separate PRs.

[nrc]

Thank you! It's great to see this project unfolding over so many PRs!