Add console output for Listing 15-29 in chapter 15 #4472
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Description
This PR adds the missing console output for Listing 15-29 in Chapter 15 (“Smart Pointers”).
The output demonstrates the changes in strong_count and weak_count when branch is created in an inner scope and then dropped.
Changes
src/ch15-06-reference-cycles.md.Reason
The example previously lacked the actual runtime output, making it harder for readers to follow the explanation in the following paragraph. This change aligns the format with other listings in the book, where code examples are typically followed by their output.