[Book][Service Container] Fix syntax highlighting
bug #3519 [Book][Service Container] Fix syntax highlighting (iamdto)

This PR was merged into the 2.4 branch.

Discussion
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[Book][Service Container] Fix syntax highlighting

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.4+
| Fixed tickets | -

Commits
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edec44d [Book][Service Container] Fix syntax highlighting