Issue #3499928 by mogtofu33, grimreaper: Documentation: indicate that you need...

Issue #3499928 by mogtofu33, grimreaper: Documentation: indicate that you need to specify the icon size.

ui_suite_bootstrap.icons.yml

@@ -14,6 +14,7 @@ bootstrap:
   settings:
     size:
       title: "Size"
+      description: "You need to specify the size unit (px, em or other). Default value is 32px."
       type: "string"
       default: "32px"
     color:
@@ -21,8 +22,8 @@ bootstrap:
       type: "string"
     alt:
       title: "Alt text"
-      type: "string"
       description: "Accessibility alternative text, leave empty for decorative icon."
+      type: "string"
   template: >-
     <svg
       xmlns="http://www.w3.org/2000/svg"