Replace return with pure

Author: Julien Debon

posts/polysemy-first-example.markdown

@@ -94,7 +94,7 @@ myBusinessFunction m n = do
              " and " <> show n
   let result = m + n
   putStrLn $ "myBusinessFunction result is " <> show result
-  return result
+  pure result
 ```
 
 `IO` is too coarse, we want to replace its use with our shiny new effect. Fear not, my friend, this is as simple as:
@@ -106,7 +106,7 @@ myBusinessFunction m n = do
             " and " <> show n
   let result = m + n
   logInfo $ "myBusinessFunction result is " <> show result
-  return result
+  pure result
 ```
 
 The main changes are:

posts/polysemy-tests.markdown

@@ -34,7 +34,7 @@ myBusinessFunction m n = do
             " and " <> show n
   let result = m + n
   logInfo $ "myBusinessFunction result is " <> show result
-  return result
+  pure result
 
 logToIO :: Member (Embed IO) r => Sem (Log ': r) a -> Sem r a
 logToIO = interpret (\(LogInfo stringToLog) -> embed $ putStrLn stringToLog)