Document bg-repeat-round and bg-repeat-space

Author: benface

source/docs/background-repeat.blade.md

@@ -31,6 +31,16 @@ features:
       'background-repeat: repeat-y;',
       'Repeat the background image only vertically.',
     ],
+    [
+      '.bg-repeat-round',
+      'background-repeat: round;',
+      'Repeat the background image as much as possible without clipping, stretching the image until there is room for another one to be added, leaving no gap between them.',
+    ],
+    [
+      '.bg-repeat-space',
+      'background-repeat: space;',
+      'Repeat the background image as much as possible without clipping, distributing whitespace evenly between the images.',
+    ],
   ]
 ])