add a note that borg 1.1.x is not supported any more

this refers to support by borgbackup development, like
making new releases with bugfixes or new features.

there might be still support from other parties, like
e.g. security update support from linux distributors.

Author: ThomasWaldmann

releases/index.rst

@@ -38,7 +38,7 @@ The current release is |current1.2|, released on |current1.2date|.
 Borg 1.1
 --------
 
-Borg 1.1 is the current **oldstable** series of Borg.
+Borg 1.1 is not supported any more, please use Borg 1.2.x.
 The current release is |current1.1|, released on |current1.1date|.
 
 - `1.1.0 release announcement <borg-1.1.html>`_
@@ -49,7 +49,7 @@ The current release is |current1.1|, released on |current1.1date|.
 Borg 1.0
 --------
 
-Borg 1.0 is not supported any more, please use 1.1.x.
+Borg 1.0 is not supported any more, please use Borg 1.2.x.
 The last release in this series was |current1.0|, released on |current1.0date|.
 
 - `Documentation <https://borgbackup.readthedocs.io/en/1.0-maint/>`__