README tweak

Author: dingosky

EntropyString.playground/Pages/TLDR2.xcplaygroundpage/Contents.swift

@@ -1,7 +1,6 @@
 //: [Previous](@previous)
 //: ## TLDR 2
 //: ### Take Away
-//:
 //:  - You don't need random strings of length L.
 //:    - String length is a by-product, not a goal.
 //:  - You don't need truly unique strings.
@@ -12,11 +11,10 @@
 //:  - You need to a total of **_N_** strings with a risk **_1/n_** of repeat.
 //:    - The characters are arbitrary.
 //:  - You need `EntropyString`.
+//: ##### In a million strings, a 1 in a billion chance of a repeat (using 32 possible characters):
 import EntropyString
 
-let N: Entropy.Power = .ten06
-let n: Entropy.Power = .ten09
-var bits = Entropy.bits(for: N, risk: n)
+let bits = Entropy.bits(for: .ten06, risk: .ten09)
 let string = RandomString.entropy(of: bits, using: .charSet32)
 //: * callout(string): DdHrT2NdrHf8tM
 

README.md

@@ -532,12 +532,11 @@ Note how the number of bytes needed is dependent on the number of characters in
     - The characters are arbitrary.
   - You need `EntropyString`.
 
+##### In a *million* strings, a *1 in a billion* chance of a repeat (using 32 possible characters):
 ```swift
   import EntropyString
 
-  let N: Entropy.Power = .ten06
-  let n: Entropy.Power = .ten09
-  var bits = Entropy.bits(for: N, risk: n)
+  let bits = Entropy.bits(for: .ten06, risk: .ten09)
   let string = RandomString.entropy(of: bits, using: .charSet32)
 ```