[php-maint] Bug#392249: php5-common: at least users should be cautioned in README.Debian

[Gaochao]

Package: php5-common
Version: 5.2.0-5
Followup-For: Bug #392249

  When add/remove php5 extensions(not only php5-mysql), apache should be 
restart to apply changes, so at least users should be cautioned this in 
README.Debian.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-2-k7
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages php5-common depends on:
ii  sed                           4.1.5-1    The GNU sed stream editor

php5-common recommends no packages.

-- no debconf information