Revert "can't use a : in the content."

This reverts commit 9cc3231.

Author: BillWagner

docs/csharp/tutorials/exploration/csharp-7.yml

@@ -106,7 +106,7 @@ items:
 when inspecting the tuple using reflection at runtime, for example.
 
     In a tuple assignment, you can also specify the names of the fields
-    on the right-hand side of the assignment.
+    on the right-hand side of the assignment:
 
     [!code-csharp[ImplicitNamedTuple](~/samples/snippets/csharp/new-in-7/program.cs#06_ImplicitNamedTuple "Implicitly named tuple")]