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This PR eliminates uses of `intros x y z` (with arguments) and updates the `intros` docstring to suggest that `intro x y z` should be used instead. The `intros` tactic is historical, and can be traced all the way back to Lean 2, when `intro` could only introduce a single hypothesis. Since 2020, the `intro` tactic has superceded it. The `intros` tactic (without arguments) is currently still useful.
Developer Documentation and Examples
This directory contains documentation that describes how to work on
Lean itself, as well as examples that are included in documentation
that's hosted on the Lean website. The make directory contains
information on building Lean, and the dev directory describes how to
work on Lean.
The documentation section has links to documentation that describes how to use Lean itself.