basic hierarchy in place

docs/Debug.md

@@ -1,38 +1,96 @@
 Debug
 =====
 
+Stubbing
+--------
+
+#### undefined
+
 ```haskell
 undefined :: a
 ```
 
+An undefined expression standing in for an incomplete program, unevaluated type
+witness, or unreachable code branch.
+
+*Example*:
+
+```haskell
+> import Foreign.Storable 
+> print (sizeOf (undefined :: Int))
+8
+```
+
+#### notImplemented
+
 ```haskell
 notImplemented :: a
 ```
 
+An undefined expression standing in for a yet to completed program.
+
+*Example*:
+
+```haskell
+main :: IO ()
+main = notImplemented
+```
+
+Tracing
+-------
+
+#### trace
+
 ```haskell
 trace :: Print b => b -> a -> a
 ```
 
+*Example*:
+
+#### traceM
+
 ```haskell
 traceM :: (Monad m) => Text -> m ()
 ```
 
+*Example*:
+
+#### traceId
+
 ```haskell
 traceId :: Text -> Text
 ```
 
+*Example*:
+
+#### traceShowM
+
 ```haskell
 traceShowM :: (P.Show a, Monad m) => a -> m ()
 ```
 
+*Example*:
+
+#### traceShowId
+
 ```haskell
 traceShowId :: P.Show a => a -> a
 ```
 
+*Example*:
+
+#### traceShow
+
 ```haskell
 traceShow :: P.Show a => a -> b -> b
 ```
 
+*Example*:
+
+#### traceIO
+
 ```haskell
 traceIO :: Print b => b -> a -> IO a
 ```
+
+*Example*: