Website only: Update first example to use try with resources

[rbygrave]

This changes the first example on the website from using try/finally to using try with resources.

This fixes 2 issues with my previous PR for the first website example.

• The actual linked GetExample.java uses try with resources (not try finally so my change didn't match the linked GetExample.java)
• My try/finally example had issues. It didn't initialise the Response properly and close if non-null etc

Apologies for getting this wrong in the first PR. I think this fixes those 2 issues in my previous PR and I think it is nice if the first example code seen is as simple and clean (and correct) as possible (I think try with resources is a bit cleaner/nicer than try/finally).

[swankjesse]

One small problem with this is that most of our users are building with tools that don't worry try with resources. But it's still an improvement over broken code.

[rbygrave]

users are building with tools that don't worry try with resources

Yes. I'll push up a separate 3rd example with a separate try/finally example. It uses Util.closeQuietly() which you may consider internal and wish to discourage (so maybe this isn't quite right) but I'll put it up for review.

[swankjesse]

Yep. closeQuietly is in internal and not for our users!