correct path to "more examples"

old path was pointing to the same examples (core)

new path points to the Design Center which has more, different examples
Remove path to input file because file is in inputs dir
Fix grammar.
Move mention of the policy server to the very top, so it is clear it applies to all the steps.  Before, we mentioned it partway through the procedure.
Remove phrase "Some examples require additional steps - see the respective documentation page for details"
as it is unclear and confusing. Which examples?  What additional steps?  Where is the documentation page?
Tighten the two sentences into one.
simplify the "hello world" example by removing the body block
Merge pull request #25 from atsaloli/master

Edit examples.markdown: fix URL to more examples and tighten the text.  Edit manuals.markdown: simplify "hello world" example.