- add entities for the current oldstable/stable/testing codenames
* doc/sources.list.5.xml:
- use stable-codename instead of stable in the examples (Closes: #531492)
* doc/apt_preferences.5.xml:
- adapt some examples here to use current codenames as well
<listitem><para>Default release to install packages from if more than one
version available. Contains release name, codename or release version. Examples: 'stable', 'testing', 'unstable', 'lenny', 'squeeze', '4.0', '5.0*'. See also &apt-preferences;.</para></listitem>
<listitem><para>Default release to install packages from if more than one
version available. Contains release name, codename or release version. Examples: 'stable', 'testing',
'unstable', '&stable-codename;', '&testing-codename;', '4.0', '5.0*'. See also &apt-preferences;.</para></listitem>