fix: invalid link for stream creator test

[ryabykhms]

In the PR https://github.com/sablier-labs/examples/pull/20, the test referenced in the documentation was removed and a new one was created.

[smol-ninja]

Thank you so much for the PR and for fixing the hyperlink issue @ryabykhms. This looks good to me 🚀. There are a few points that I would like to share with you:

• The contract name in LockupStreamCreator.t.sol should be LockupStreamCreatorTest. Currently, it is LockupLinearStreamCreatorTest. Would you also like to create a PR in examples repo to fix that?

• In the message after running forge test, the following should be replaced

  Running 1 test for test/StreamCreator.t.sol:StreamCreatorTest
  [PASS] test_CreateStream() (gas: { gasValue })
  Test result: ok. 1 passed; 0 failed; finished in { time }

by

Ran 2 tests for v2/core/LockupStreamCreator.t.sol:LockupStreamCreatorTest
[PASS] test_LockupDynamicStreamCreator() (gas: 273719)
[PASS] test_LockupLinearStreamCreator() (gas: 186388)
Suite result: ok. 2 passed; 0 failed; 0 skipped; finished in 6.34s (5.80s CPU time)

to make it look more realistic. Would you also like to include this in the PR?

[ryabykhms]

Thank you for your comment @smol-ninja. I fixed that here: https://github.com/sablier-labs/examples/pull/31