fix(ReviewerEmail): Used .join after .map on authorsList

packages/component-manuscript-manager/src/notifications/notification.js

@@ -740,9 +740,9 @@ class Notification {
       type: 'submitted',
     })
 
-    const authorsList = authors.map(
-      author => `${author.firstName} ${author.lastName}`,
-    )
+    const authorsList = authors
+      .map(author => `${author.firstName} ${author.lastName}`)
+      .join(', ')
     const authorName = `${submittingAuthor.firstName} ${
       submittingAuthor.lastName
     }`
@@ -790,7 +790,7 @@ class Notification {
           ctaText: 'MANUSCRIPT DETAILS',
           title,
           paragraph,
-          authorsList: authorsList.join(', '),
+          authorsList,
           signatureName: handlingEditor.name,
           unsubscribeLink: services.createUrl(this.baseUrl, unsubscribeSlug, {
             id: reviewer.id,