Fix URL to point to the new default branch.
Fixes the typo mentioned in
Example Deploys
===============
-If you are getting started with ``pyinfra`` checkout `the examples on Github <https://github.com/Fizzadar/pyinfra/tree/master/examples>`_ which should properly introduce the file/folder structure as well as operation basics.
+If you are getting started with ``pyinfra`` checkout `the examples on Github <https://github.com/Fizzadar/pyinfra/tree/2.x/examples>`_ which should properly introduce the file/folder structure as well as operation basics.
Included here is a set of documented example deploys highlighting common patterns and best practices:
