Updated Release checklist (markdown)

Release-checklist.md

@@ -38,7 +38,7 @@ Note that some of these can be done concurrently.
 Treat Libretro as just another core in this context.
 The cores under "Other cores:" are in alphabetical order, new/graduating aren't.
 The changes should be sorted with the most important first, but that's kinda subjective so don't try too hard.
-Obviously omit empty headings.
+Obviously, omit empty headings.
 ```
 - Misc. changes to EmuHawk:
 	- change