chore(issue-templates): add comma after otherwise (#18666)

Author: lekterable

.github/ISSUE_TEMPLATE/bug_report.md

@@ -4,7 +4,7 @@ about: Something isn't working as expected? Here is the right place to report.
 ---
 
 <!--
-  Please fill out each section below, otherwise your issue will be closed. This info allows Gatsby maintainers to diagnose (and fix!) your issue as quickly as possible.
+  Please fill out each section below, otherwise, your issue will be closed. This info allows Gatsby maintainers to diagnose (and fix!) your issue as quickly as possible.
 
   Useful Links:
   - Documentation: https://www.gatsbyjs.org/docs/

.github/ISSUE_TEMPLATE/feature_request.md

@@ -4,7 +4,7 @@ about: Suggest a new idea for the project.
 ---
 
 <!--
-  Please fill out each section below, otherwise your issue will be closed.
+  Please fill out each section below, otherwise, your issue will be closed.
 
   Useful Links:
   - Gatsby RFCs: https://github.com/gatsbyjs/rfcs

.github/ISSUE_TEMPLATE/new_translation.md

@@ -4,7 +4,7 @@ about: Suggest a new language translation of the repo.
 ---
 
 <!--
-  Please fill out the YAML form below, otherwise your issue will be closed.
+  Please fill out the YAML form below, otherwise, your issue will be closed.
 
   - *Name*: Language name in *English*
   - *Code*: [ISO-693 Code]() or [IETF language tag](https://en.wikipedia.org/wiki/IETF_language_tag) of the language