Update comment for predict to update Ludwig docs

[Infernaught]

Updated a comment for generate() under LudwigModel in api.py so that it would automatically reflect in the Ludwig docs.

[github-actions]

Unit Test Results

  6 files  ±0    6 suites  ±0   1h 3m 54s ⏱️ + 2m 4s
34 tests ±0  27 ✔️  - 2    7 💤 +2  0 ❌ ±0 
88 runs  ±0  64 ✔️  - 8  24 💤 +8  0 ❌ ±0 

Results for commit 46f8d96. ± Comparison against base commit 5ba3494.

This pull request skips 2 tests.

tests.regression_tests.benchmark.test_model_performance ‑ test_performance[ames_housing.gbm.yaml]
tests.regression_tests.benchmark.test_model_performance ‑ test_performance[mercedes_benz_greener.gbm.yaml]

♻️ This comment has been updated with latest results.

[justinxzhao]

Hi Tim, could you also change the format of this docstring back to sphinx-ish style like the other functions in this file?

I had changed the docstring to Google style, but the code_doc_autogen binary doesn't parse Google style docstrings correctly.