DOC Adds LSTM docs for defined variables when bidirectional=True (#60120)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/59332
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60120
Reviewed By: gchanan
Differential Revision: D29240245
Pulled By: jbschlosser
fbshipit-source-id: acad9c24f41f7253a7d42cd940e54bb66e083ecf
