docs(panel): updates Panel documentation for Rails

docs/app/views/examples/components/panel/_preview.html.erb

@@ -52,11 +52,11 @@ Ut elementum id leo ac fringilla.
 
 <h3>Header</h3>
 
-<p>This area usually contains at least a title and an icon or menu positioned in the right corner, both optional. An optional subtext element is useful for documenting the panel objective. It employs the Sage Row layout base with `24px` gutters.</p>
+<p>This area usually contains at least a title and an icon or menu positioned in the right corner, both optional. An optional subtext element is useful for documenting the panel objective. It employs the Sage Row layout base with <code>24px</code> gutters.</p>
 
 <h3>Body</h3>
 
-There are a couple of options for the panel body.
+There are a few for the panel body container.
 
 <h4>Panel Block</h4>
 
@@ -206,6 +206,6 @@ There are a couple of options for the panel body.
 
 <p>A panel figure contains an image that occupies a substantive space in the panel, typically filling edge to edge. See the <a classs="sage-link" href="panel_figure">Panel Figure component</a>, for more details.</p>
 
-<h4>Panel Figure Utility</h4>
+<h5>Panel Figure Utility</h5>
 
 <p>The <code>.sage-panel-grid`</code> utility class can be added onto containers in order to enforce the Panel's internal grid settings.This is helpful in cases where a container of some sort is needed around contents but those contents should still recieve the standard Panel-scoped gaps.</p>