Corrected typo in usage.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2021-07-29 19:57:49
Author local date 2021-07-29 21:57:49 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2021-07-29 19:57:49
Committer local date 2021-07-29 21:57:49 +0200
Commit 5689049cea67f0899198f47b669465ec9f2b7820
Tree 8a73ba1739287fac6de00e0b2befb9309870d5eb
Parent a2db723181abeff11252eacad26e4d0199c1bb15
Corrected typo in usage.
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