DOC: small fixes categorical docs
DOC: Fix release note for GH7798
REGR: Regression in multi-index indexing with a non-scalar type object (GH7914)
Merge pull request #7920 from sinhrks/rn7798

DOC: Fix release note for GH7798
Merge pull request #7917 from jorisvandenbossche/docs-categorical-fixes

DOC: small fixes categorical docs
Merge pull request #7921 from jreback/mi_index

REGR: Regression in multi-index indexing with a non-scalar type object (GH7914)
update to holiday to help with GH#7070