Merge pull request scala-exercises#42 from paine724/patch-1

Add a message to let users know tuples are indexed beginning at 1

Author: Rafa Paradela

app/json/tuples.json

@@ -2,7 +2,7 @@
   "title": "Tuples",
   "modules": [
     {
-      "preparagraph": "Scala tuple combines a fixed number of items together so that they can be passed around as a whole. Unlike an array or list, a tuple can hold objects with different types but they are also immutable. Here is an example of a tuple holding an integer, a string, and the console:\n\n```\nval t = (1, \"hello\", Console)\n```\n\nWhich is syntactic sugar (short cut) for the following:\n\n```\nval t = new Tuple3(1, \"hello\", Console)\n```\nAs you can see, tuples can be created easily:",
+      "preparagraph": "Scala tuple combines a fixed number of items together so that they can be passed around as a whole. They are one indexed. Unlike an array or list, a tuple can hold objects with different types but they are also immutable. Here is an example of a tuple holding an integer, a string, and the console:\n\n```\nval t = (1, \"hello\", Console)\n```\n\nWhich is syntactic sugar (short cut) for the following:\n\n```\nval t = new Tuple3(1, \"hello\", Console)\n```\nAs you can see, tuples can be created easily:",
       "code": "val tuple = (\"apple\", \"dog\")\nval fruit = tuple._1\nval animal = tuple._2\n\nfruit should be(__)\nanimal should be(__)",
       "solutions": [
         "\"apple\"",
@@ -39,4 +39,4 @@
       "postparagraph": ""
     }
   ]
-}
+}