Fix pdf links in the documentation

Fix #1436

doc/en/contents.rst

@@ -3,7 +3,7 @@
 Full pytest documentation
 ===========================
 
-`Download latest version as PDF <pytest.pdf>`_
+`Download latest version as PDF <https://media.readthedocs.org/pdf/pytest/latest/pytest.pdf>`_
 
 .. `Download latest version as EPUB <http://media.readthedocs.org/epub/pytest/latest/pytest.epub>`_
 

doc/en/getting-started.rst

@@ -11,7 +11,7 @@ Installation and Getting Started
 `colorama (Windows) <http://pypi.python.org/pypi/colorama>`_,
 `argparse (py26) <http://pypi.python.org/pypi/argparse>`_.
 
-**documentation as PDF**: `download latest <http://pytest.org/latest/pytest.pdf>`_
+**documentation as PDF**: `download latest <https://media.readthedocs.org/pdf/pytest/latest/pytest.pdf>`_
 
 .. _`getstarted`:
 .. _installation:

doc/en/index.rst

@@ -10,7 +10,7 @@ pytest: helps you write better programs
  - free and open source software, distributed under the terms of the :ref:`MIT license <license>`
  - **well tested** with more than a thousand tests against itself
  - **strict backward compatibility policy** for safe pytest upgrades
- - :ref:`comprehensive online <toc>` and `PDF documentation <pytest.pdf>`_
+ - :ref:`comprehensive online <toc>` and `PDF documentation <https://media.readthedocs.org/pdf/pytest/latest/pytest.pdf>`_
  - many :ref:`third party plugins <extplugins>` and :ref:`builtin helpers <pytest helpers>`,
  - used in :ref:`many small and large projects and organisations <projects>`
  - comes with many :ref:`tested examples <examples>`