[Merged by Bors] - fix(library/init/meta/tactic.lean): turn comment into docstring #646
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This seems to be a slip, rather than a deliberate decision to not make the comment above
subst_core
into its docstring. It's very rare that I try to read meta code, but today I was trying to understand howsubst
worked and ran into the fact thatsubst_core
had no docstring.