CF tutorial: No identity in else case (#1384)

* CF tutorial: No identity in else case

* Sinkhorn

Author: Pangoraw

docs/src/tutorials/control-flow.md

@@ -19,7 +19,7 @@ function maybe_square(cond, x)
     if cond
         x = x .^ 2
     else
-        x = x
+        x = x .^ 3
     end
     return x
 end
@@ -146,7 +146,8 @@ x = Reactant.to_rarray([1., 2., 3.])
 ```
 
 Similarly, one can trace while loops. The following is a minimal implementation of the
-[Sinkhorn-Knopp algorithm]() which aims to solve the entropic optimal transport problem:
+[Sinkhorn-Knopp algorithm](https://en.wikipedia.org/wiki/Sinkhorn's_theorem) which aims
+to solve the entropic optimal transport problem:
 
 ```@example control_flow_tutorial
 using LinearAlgebra: Diagonal