more typo

docs/palera1n.1

@@ -123,7 +123,7 @@ when built, should be used. PongoOS 2.6.0 or later is required.
 Override the kernel patchfinder PongoOS module. The module is required to support setting
 root filesystem in paleinfo with
 .Em rootfs
-command. If it doubt, use
+command. If in doubt, use
 .Sy https://github.com/guacaplushy/PongoOS
 iOS15 branch or your own fork of it.
 .It Fl l , -rootless