config.fish: improve documentation on creating Fish functions (fix #128 an #76)

Shell-aliases.md

@@ -9,8 +9,16 @@ alias fuck='eval $(thefuck $(fc -ln -1))'
 
 Add this function to `config.fish`:
 ```fish
-function fuck
-    eval (thefuck $history[1])
+function __thefuck_repl -d 'Replace operators into fish-compatible'
+    set -l tmp (echo $argv | sed 's/ && / ; and /g')
+    echo $tmp | sed 's/ || / ; or /g'
+end
+
+function fuck -d 'Correct your previous console command'
+    set -l eval_script (mktemp 2>/dev/null ; or mktemp -t 'thefuck')
+    thefuck $history[1] > $eval_script
+    eval (__thefuck_repl (cat $eval_script))
+    rm $eval_script
 end
 ```