Fix wrong package name

`cabal` should be `cabal-install`

Author: pp3345

tech/languages/haskell/leksah.md

@@ -12,7 +12,7 @@ packages with automatic build of dependencies. It enables standard IDE features
 To install Leksah run command:
 
 ```
-$ sudo dnf install ghc cabal
+$ sudo dnf install ghc cabal-install
 ```
 
 or install Haskell Platform by command: