Merge pull request #89 from rolson/patch-1

Fix reference doc variable references

Author: lorentey

Sources/Atomics/AtomicLazyReference.swift.gyb

@@ -179,16 +179,16 @@ extension ${type} {
   ///
   /// ```
   /// class Image {
-  ///   var _histogram: UnsafeAtomicLazyReference<Histogram> = ...
+  ///   var _histogram: UnsafeAtomicLazyReference<Histogram> = .init()
   ///
   ///   // This is safe to call concurrently from multiple threads.
   ///   var atomicLazyHistogram: Histogram {
-  ///     if let histogram = _histogram.load() { return foo }
+  ///     if let histogram = _histogram.load() { return histogram }
   ///     // Note that code here may run concurrently on
   ///     // multiple threads, but only one of them will get to
   ///     // succeed setting the reference.
   ///     let histogram = ...
-  ///     return _histogram.storeIfNilThenLoad(foo)
+  ///     return _histogram.storeIfNilThenLoad(histogram)
   /// }
   /// ```
   ///