Fix alternative backend syntax example for DRink!

[davidsemakula]

See use-ink/ink#2083

[davidsemakula]

@cmichi Additionally, the example link here is also broken.
It can be fixed by linking to https://github.com/paritytech/ink/blob/master/integration-tests/e2e-runtime-only-backend/lib.rs but I think the intention was to copy that test over to the ink! examples repo?

[cmichi]

@davidsemakula Could you check that there's nothing to be updated for either use-ink/ink#2143 nor use-ink/ink#2140?

[cmichi]

@cmichi Additionally, the example link here is also broken. It can be fixed by linking to https://github.com/paritytech/ink/blob/master/integration-tests/e2e-runtime-only-backend/lib.rs but I think the intention was to copy that test over to the ink! examples repo?

Thanks for flagging it! We'll copy the test over. @smiasojed Can you take care of including this test in our public examples?

The intention behind the copying was that the ink-examples contain examples with a source code that fits the last published release, whereas the contracts in ink/integration-tests often already have some breaking unreleased changes in master.

[davidsemakula]

... Could you check that there's nothing to be updated for either paritytech/ink#2143 nor paritytech/ink#2140?

@cmichi confirmed 👍
5.x docs don't (mis)use any syntax that's been removed/changed by use-ink/ink#2140, use-ink/ink#2143 or use-ink/ink#2146