Properly comment paragraph change

Co-authored-by: Jeff Ong <jeff.ong@automattic.com>

varia/sass/layout/_structure.scss

@@ -87,7 +87,7 @@
 .site-main > article > *, // apply vertical margins to article level
 .site-main > .not-found > *, // apply vertical margins to article level
 .entry-content > *,
-.entry-content p, //ensure proper margins in Premium Content block
+.entry-content p, // ensure all paragraphs, including nested ones, carry a margin
 [class*="inner-container"] > *,
 .widget-area > * {