upgrading/4.2.0.txt: Fix numbering

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

upgrading/4.2.0.txt

@@ -36,7 +36,7 @@ UPDATE PackageComments SET DelTS = EditedTS WHERE DelUsersID IS NOT NULL;
 ALTER TABLE PackageRequests ADD COLUMN ClosureComment TEXT NOT NULL DEFAULT '';
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-4. Change FlaggerComment from varchar to text.
+6. Change FlaggerComment from VARCHAR to TEXT:
 
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 ALTER TABLE PackageBases MODIFY COLUMN FlaggerComment TEXT NOT NULL DEFAULT '';