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[Merged by Bors] - chore(group_theory/nielsen_schreier): typos in module doc-string #7500

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[Merged by Bors] - chore(group_theory/nielsen_schreier): typos in module doc-string #7500

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chore(group_theory/nielsen_schreier): typos in module doc-string
dwarn May 4, 2021
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Update src/group_theory/nielsen_schreier.lean
dwarn May 5, 2021
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4 changes: 2 additions & 2 deletions src/group_theory/nielsen_schreier.lean
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Expand Up @@ -23,9 +23,9 @@ but we work directly with groupoids instead of topological spaces. Under this an
- `is_free_groupoid G` corresponds to saying that a space is a graph.
- `End_mul_equiv_subgroup H` plays the role of replacing 'subgroup of fundamental group' with
'fundamental group of covering space'.
- `action_category_is_free G A` corresponds to the fact that a covering of a (single-vertex)
- `action_groupoid_is_free G A` corresponds to the fact that a covering of a (single-vertex)
graph is a graph.
- `End_is_free_group_of_arborescence` corresponds to the fact that, given a spanning tree of a
- `End_is_free T` corresponds to the fact that, given a spanning tree `T` of a
graph, its fundamental group is free (generated by loops from the complement of the tree).

## Implementation notes
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