docs: add a reminder for updating the related documentation (#2292)

Author: tatomyr

.github/pull_request_template.md

@@ -11,6 +11,7 @@
 - [ ] Code changed? - Tested with Redoc/Realm/Reunite (internal)
 - [ ] All new/updated code is covered by tests
 - [ ] New package installed? - Tested in different environments (browser/node)
+- [ ] Documentation update considered
 
 ## Security