Update some phpdocs, courtesy of Psalm.

app/Support/Http/Controllers/ModelInformation.php

@@ -70,8 +70,11 @@ trait ModelInformation
     }
 
     /**
-     * @codeCoverageIgnore
-     * @return array
+     * @codeCoverageIgnore 
+     *
+     * @return string[]
+     *
+     * @psalm-return array<int|null, string>
      */
     protected function getLiabilityTypes(): array
     {

app/Support/Http/Controllers/TransactionCalculation.php

@@ -172,7 +172,7 @@ trait TransactionCalculation
      * @param Carbon $start
      * @param Carbon $end
      *
-     * @return Collection
+     * @return array
      */
     protected function getIncomeForTags(Collection $accounts, Collection $tags, Carbon $start, Carbon $end): array
     {