Remove Haskell tags from error message code blocks

Author: TauOmicronMu

message-index/messages/GHC-00158/example1/index.md

@@ -6,7 +6,7 @@ GHC cannot derive an instance for `MyClass`, as it is not stock deriveable. Enab
 
 ## Error Message
 
-```haskell
+```
 NotStockDeriveable.hs:6:12: error: [GHC-00158]
     • Can't make a derived instance of ‘MyClass MyType’:
         ‘MyClass’ is not a stock derivable class (Eq, Show, etc.)

message-index/messages/GHC-00158/example2/index.md

@@ -6,7 +6,7 @@ In this example, the `stock` strategy is incorrectly specified when deriving the
 
 ## Error Message
 
-```haskell
+```
 IncorrectDerivingStrategy.hs:6:18: error: [GHC-00158]
     • Can't make a derived instance of
         ‘Num IntWrapper’ with the stock strategy:

message-index/messages/GHC-00482/example1/index.md

@@ -6,7 +6,7 @@ When pattern matching with a `case` expression, backslash (`\`) is not required
 
 ## Error Message
 
-```haskell
+```
 LambdaInCase.hs:6:5: error: [GHC-00482]
     Lambda-syntax in pattern.
     Pattern matching on functions is not possible.

message-index/messages/GHC-00482/example2/index.md

@@ -6,7 +6,7 @@ Pattern matching on functions is not possible.
 
 ## Error Message
 
-```haskell
+```
 LambdaInPattern.hs:4:4: error: [GHC-00482]
     Lambda-syntax in pattern.
     Pattern matching on functions is not possible.