Fixed typo

Author: Nyholm

src/Api/Issue/GithubIssueApi.php

@@ -31,8 +31,8 @@ public function open(Repository $repository, string $title, string $body, array
         ];
 
         $issueNumber = null;
-        $exitingIssues = $this->searchApi->issues(sprintf('repo:%s "%s" is:open author:%s', $repository->getFullName(), $title, $this->botUsername));
-        foreach ($exitingIssues['items'] ?? [] as $issue) {
+        $existingIssues = $this->searchApi->issues(sprintf('repo:%s "%s" is:open author:%s', $repository->getFullName(), $title, $this->botUsername));
+        foreach ($existingIssues['items'] ?? [] as $issue) {
             $issueNumber = $issue['number'];
         }