Update description per @Insti comments

coriolinus · web-flow · commit a636903cd00f · 2017-11-27T17:24:52.000+01:00
diff --git a/exercises/book-store/canonical-data.json b/exercises/book-store/canonical-data.json
@@ -103,7 +103,7 @@
         },
         {
          "property": "total",
-         "description": "Two moves are required to find minimal price",
+         "description": "Four groups of four are cheaper than two groups each of five and three",
          "basket": [1,1,2,2,3,3,4,5,1,1,2,2,3,3,4,5],
          "targetgrouping": [[1,2,3,4],[1,2,3,5],[1,2,3,4],[1,2,3,5]],
          "expected": 102.4

Original file line number	Diff line number	Diff line change
`@@ -103,7 +103,7 @@`
`103`	`103`	`},`
`104`	`104`	`{`
`105`	`105`	`"property": "total",`
`106`		`- "description": "Two moves are required to find minimal price",`
	`106`	`+ "description": "Four groups of four are cheaper than two groups each of five and three",`
`107`	`107`	`"basket": [1,1,2,2,3,3,4,5,1,1,2,2,3,3,4,5],`
`108`	`108`	`"targetgrouping": [[1,2,3,4],[1,2,3,5],[1,2,3,4],[1,2,3,5]],`
`109`	`109`	`"expected": 102.4`