Add example from wikipedia

Author: mborland

doc/decimal/overview.adoc

@@ -26,6 +26,7 @@ These are referred to as cohorts which binary does not have as there is only one
 
 The use case for Decimal Floating Point numbers is where rounding errors are significantly impactful such as finance.
 In applications where integer or fixed-point arithmetic are used to combat this issue Decimal Floating Point numbers can provide a significantly greater range of values.
+For example, while a fixed-point representation that allocates 8 decimal digits and 2 decimal places can represent the numbers 123456.78, 8765.43, 123.00, and so on, a floating-point representation with 8 decimal digits could also represent 1.2345678, 1234567.8, 0.000012345678, 12345678000000000, and so on.
 
 == Supported Compilers