Update tut. to not sound like I missed a section

The sentence "Remember that `(float, float)` is a tuple of two floats" sounds like you've already read a section on tuples, but that section comes later. Changing it to "Assuming that ..." makes it more about taking the writer's word that the syntax is how tuples are defined.
brettcannon · Apr 3, 2013 · 8dd5a70 · 8dd5a70
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commit 8dd5a70
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/doc/tutorial.md b/doc/tutorial.md
@@ -495,7 +495,7 @@ omitted.
 
 A powerful application of pattern matching is *destructuring*:
 matching in order to bind names to the contents of data
-types. Remember that `(float, float)` is a tuple of two floats:
+types. Assuming that `(float, float)` is a tuple of two floats:
 
 ~~~~
 fn angle(vector: (float, float)) -> float {