Update some phpdocs, courtesy of Psalm.

app/Console/Commands/Correction/CreateLinkTypes.php

@@ -47,7 +47,7 @@ class CreateLinkTypes extends Command
     /**
      * Execute the console command.
      *
-     * @return mixed
+     * @return int
      */
     public function handle(): int
     {

app/Console/Commands/Correction/DeleteEmptyGroups.php

@@ -50,7 +50,8 @@ class DeleteEmptyGroups extends Command
      * Execute the console command.
      *
      * @throws Exception;
-     * @return mixed
+     *
+     * @return int
      */
     public function handle(): int
     {

app/Console/Commands/Correction/EnableCurrencies.php

@@ -52,7 +52,7 @@ class EnableCurrencies extends Command
     /**
      * Execute the console command.
      *
-     * @return mixed
+     * @return int
      */
     public function handle(): int
     {

app/Console/Commands/Correction/FixPiggies.php

@@ -54,7 +54,7 @@ class FixPiggies extends Command
     /**
      * Execute the console command.
      *
-     * @return mixed
+     * @return int
      */
     public function handle(): int
     {

app/Console/Commands/Correction/RemoveBills.php

@@ -48,7 +48,7 @@ class RemoveBills extends Command
     /**
      * Execute the console command.
      *
-     * @return mixed
+     * @return int
      */
     public function handle(): int
     {