Rollup merge of #130933 - lolbinarycat:rustdoc-li-p, r=GuillaumeGomez…

…,notriddle

rustdoc: lists items that contain multiple paragraphs are more clear

fixes #130622

before: ![before](https://github.com/user-attachments/assets/fe54d8ee-8a1a-45fc-9434-2737c5c6f4d5)

after:
![after](https://github.com/user-attachments/assets/095be365-1bfc-4001-8664-59bc4125bb05)

src/librustdoc/html/static/css/rustdoc.css

@@ -960,6 +960,13 @@ pre, .rustdoc.src .example-wrap, .example-wrap .src-line-numbers {
 	display: inline-block;
 }
 
+.docblock li {
+	margin-bottom: .8em;
+}
+.docblock li p {
+	margin-bottom: .1em;
+}
+
 /* "where ..." clauses with block display are also smaller */
 div.where {
 	white-space: pre-wrap;