fix: do not generate empty docstring for Rule

[sunng87]

The recent nightly of clippy just introduced a new lint called empty_doc for checking empty doc string.

The code generated from pest_generator is always including a doc string even if it's empty. So we get this lint error on derive line: https://github.com/sunng87/handlebars-rust/actions/runs/8130508982/job/22218782435#step:4:133

This patch fixes this by skipping #doc when it's empty.

[coderabbitai]

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