Help: Remove versionadded for CMake 2.x

This removes all `versionadded` RST directives mentioning CMake 2.x
branch from CMake modules.  These version notes are now being cleaned in
the CMake 4 documentation (CMake docs are at this point considering the
2.8.12.2 as the initial state upon which new and changed items are
documented through versions).

Modules/FindCups.cmake

@@ -29,8 +29,6 @@ This module defines the following variables:
 ``CUPS_INCLUDE_DIRS``
   Include directories needed for using CUPS.
 ``CUPS_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of CUPS found.
 
 Cache Variables

Modules/FindLibXml2.cmake

@@ -38,8 +38,6 @@ This module defines the following variables:
 ``LIBXML2_DEFINITIONS``
   The compiler switches required for using libxml2.
 ``LIBXML2_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of the libxml2 found.
 
 Cache Variables

Modules/FindLibXslt.cmake

@@ -46,8 +46,6 @@ This module sets the following variables:
   Compiler switches required for using libxslt.
 
 ``LIBXSLT_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   Version of libxslt found.
 
 ``LIBXSLT_EXSLT_LIBRARIES``

Modules/FindPNG.cmake

@@ -38,8 +38,6 @@ This module sets the following variables:
 ``PNG_FOUND``
   True if PNG library is found.
 ``PNG_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of the PNG library found.
 
 Obsolete Variables

Modules/FindPerl.cmake

@@ -18,8 +18,6 @@ This module defines the following variables:
   ``PERL_FOUND`` variable is also set to the same value.
 
 ``PERL_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of Perl found.
 
 Cache Variables

Modules/FindPkgConfig.cmake

@@ -15,8 +15,6 @@ following variables will also be set:
   True if a pkg-config executable was found.
 
 ``PKG_CONFIG_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of pkg-config that was found.
 
 ``PKG_CONFIG_EXECUTABLE``

Modules/FindPythonLibs.cmake

@@ -35,8 +35,6 @@ This module defines the following variables:
   also set to the same value.
 
 ``PYTHONLIBS_VERSION_STRING``
-  .. versionadded:: 2.8.8
-
   The version of the Python libraries found.
 
 ``PYTHON_LIBRARIES``