doc_lazy_continuation: blank comment line for gap

This change addresses cases where doc comments are separated
by blank lines, comments, or non-doc-comment attributes,
like this:

```rust
/// - first line
// not part of doc comment
/// second line
```

Before this commit, Clippy gave a pedantically-correct
warning about how you needed to indent the second line.
This is unlikely to be what the user intends, and has
been described as a "false positive" (since Clippy is
warning you about a highly unintuitive behavior that
Rustdoc actually has, we definitely want it to output
*something*, but the suggestion to indent was poor).

https://github.com/rust-lang/rust-clippy/issues/12917

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