RFS: enabling openpyxl documentation

["Rebecca N. Palmer" <rebecca_palmer@zoho.com>]

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Please upload openpyxl 3.1.2+dfsg-3 to unstable
(Salsa HEAD = commit ea63a153033c7d6ed426e4931d952d027ce6b855).
This enables the documentation, and places it in a new binary
package because of its size,
which I can't do myself because DMs can't upload NEW packages.
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