fix: increase margins of autosummary tables (#1560)

* fix: increase margins of autosummary tables

* fix: the dl is not part of the table

* use the real API selector

* increase margin to 3rem

Author: 12rambau

src/pydata_sphinx_theme/assets/styles/content/_api.scss

@@ -118,6 +118,9 @@ span.highlighted {
 // the API selector
 // from https://github.com/pradyunsg/furo/blob/main/src/furo/assets/styles/content/_api.sass#L6)
 dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.glossary):not(.simple) {
+  //increase margin bottom after the dl elements
+  margin-bottom: 3rem;
+
   dd {
     margin-left: 2rem;