docs(transformer/nullish-coalescing): clarify doc comment

[overlookmotel]

Expand doc comment for create_conditional_expression to clarify what it does.

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[overlookmotel]

• refactor(transformer/nullish-coalescing): split main logic into separate function #7273
• refactor(transformer/nullish-coalescing): avoid repeated symbol lookups #7272
• fix(transformer/nullish-coalescing): correct span #7269
• docs(transformer/nullish-coalescing): clarify doc comment #7268 👈
• main

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[overlookmotel]

@Dunqing I was having trouble understanding this transform while doing #7266. This is a small docs nit, but could you please check I have it correct?

[codspeed-hq]

CodSpeed Performance Report

Merging #7268 will not alter performance

_{Comparing 11-13-docs_transformer_nullish-coalescing_correct_doc_comment (e219ae8) with main (01ddf37)}

Summary

✅ 30 untouched benchmarks

[graphite-app]

Merge activity

• Nov 14, 11:16 AM EST: A user added this pull request to the Graphite merge queue.
• Nov 14, 11:22 AM EST: A user merged this pull request with the Graphite merge queue.