fixed a typo on the italics variable

Author: CerryTsuki

PlumCherry.css

@@ -51,7 +51,7 @@
     --date-fontsize:        			12px;
     --date-weight:          			var(--weight-bold);
 
-    /* do you want headers to be italicized?*"
+    /* do you want headers to be italicized? */
     --cerry-italic:         italic;
 
     /* element adjustments */
@@ -117,4 +117,4 @@
     --invisible : rgba(0,0,0,0);
     --brand-experiment:var(--main-color);
     --input-background:var(--bg-color);
-}
+}