enclose YAML string with double quotes to fix syntax highlighting
bug #3468 enclose YAML string with double quotes to fix syntax highlighting (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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enclose YAML string with double quotes to fix syntax highlighting

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #1886

as mentioned by @ifdattic in #3467

Commits
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24be690 enclose YAML string with double quotes to fix syntax highlighting