Various code cleanup.

app/Services/Internal/Support/AccountServiceTrait.php

@@ -275,7 +275,6 @@ trait AccountServiceTrait
      * @param string $currencyCode
      *
      * @return TransactionCurrency
-     * @throws JsonException
      */
     protected function getCurrency(int $currencyId, string $currencyCode): TransactionCurrency
     {

app/Services/Internal/Support/BillServiceTrait.php

@@ -49,7 +49,6 @@ trait BillServiceTrait
             return;
         }
         $ruleIds = $bill->user->rules()->get(['id'])->pluck('id')->toArray();
-        /** @var Collection $set */
         $set = RuleAction::whereIn('rule_id', $ruleIds)
                          ->where('action_type', 'link_to_bill')
                          ->where('action_value', $oldName)->get();

app/Services/Internal/Support/JournalServiceTrait.php

@@ -194,7 +194,7 @@ trait JournalServiceTrait
      * @param array        $data
      * @param string       $preferredType
      *
-     * @return Account
+     * @return Account|null
      * @throws FireflyException
      */
     private function createAccount(?Account $account, array $data, string $preferredType): ?Account
@@ -302,7 +302,7 @@ trait JournalServiceTrait
     /**
      * @param string|null $amount
      *
-     * @return string
+     * @return string|null
      * @codeCoverageIgnore
      */
     protected function getForeignAmount(?string $amount): ?string
@@ -372,7 +372,7 @@ trait JournalServiceTrait
 
     /**
      * @param TransactionJournal $journal
-     * @param string             $notes
+     * @param string|null        $notes
      *
      * @codeCoverageIgnore
      */
@@ -405,7 +405,7 @@ trait JournalServiceTrait
      * Link tags to journal.
      *
      * @param TransactionJournal $journal
-     * @param array              $tags
+     * @param array|null         $tags
      *
      * @codeCoverageIgnore
      */

app/Services/Internal/Support/RecurringTransactionTrait.php

@@ -257,6 +257,8 @@ trait RecurringTransactionTrait
     /**
      * @param RecurrenceTransaction $transaction
      * @param int                   $categoryId
+     *
+     * @throws FireflyException
      */
     private function setCategory(RecurrenceTransaction $transaction, int $categoryId): void
     {