troubleshooting-post-install: add back accidentally removed line

oops!

Author: TophattedWasTaken

docs/troubleshooting-post-install.md

@@ -131,6 +131,7 @@ Your console is running Luma3DS 6.6 or older, likely via arm9loaderhax. You shou
 ::: details Extended memory mode games (Pokemon Sun/Moon, Smash, etc.) don't work
 
 This can occur after a CTRTransfer or region change on Old 3DS / 2DS. Follow the instructions [here](region-changing#section-vi-fixing-locale-related-issues) to fix this issue.
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 :::
 
 ::: details Exception screen when booting/loading an application