Fixes docs - background is not applicable for deployment nodes.

Author: simonbrowndotje

ui/diagrams/notation.md

@@ -56,7 +56,7 @@ The following aspects of element notation can be changed, via element styles ass
 | Icon<br />(a data URI representing a base64 encoded PNG/JPG file, or a HTTPS URL to a PNG/JPG file; SVG icons are not supported; please see the note about HTTPS and CORS below) | Yes     | Yes              | Yes        | Yes       | Yes              | Yes                 | Yes      | Yes   |
 | Width<br />(pixels; default=450)                                                                                                                                                 | Yes     | Yes              | Yes        | Yes       |                  | Yes                 |          |       |
 | Height<br />(pixels; default=300)                                                                                                                                                | Yes     | Yes              | Yes        | Yes       |                  | Yes                 |          |       |
-| Background colour<br />(HTML hex value; default="#dddddd")                                                                                                                       | Yes     | Yes              | Yes        | Yes       | Yes              | Yes                 | Yes      | Yes   |
+| Background colour<br />(HTML hex value; default="#dddddd")                                                                                                                       | Yes     | Yes              | Yes        | Yes       |                  | Yes                 | Yes      | Yes   |
 | Stroke color<br />(HTML hex value; default=a darker version of the element background)                                                                                           | Yes     | Yes              | Yes        | Yes       | Yes              | Yes                 | Yes      | Yes   |
 | Stroke width<br />(pixels, 1-10; default=2)                                                                                                                                      | Yes     | Yes              | Yes        | Yes       | Yes              | Yes                 | Yes      | Yes   |
 | Text colour<br />(HTML hex value; default="#000000")                                                                                                                             | Yes     | Yes              | Yes        | Yes       | Yes              | Yes                 | Yes      | Yes   |