Merge the following updates in the English version.

eresources.sgml 1.52 -> 1.53
firewall.sgml 1.20 -> 1.21
handbook.sgml 1.95 -> 1.96
history.sgml 1.25 -> 1.27
linuxemu.sgml 1.24 -> 1.25
mirrors.sgml 1.99 -> 1.104
pgpkeys.sgml 1.28 -> 1.30
submitters.sgml 1.262 -> 1.280