docs/manual/migrating.adoc: fix accommodate typo

Accommodate is with double-m.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit eba958eb5dcb5065e932fb8740299390ba3bff28)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/manual/migrating.adoc

@@ -143,7 +143,7 @@ The download backends have been extended in various ways.
   fields (`devmajor` and `devminor`), which has an impact in the metadata
   stored in the archives (but the content of files is not affected).
 
-To accomodate those changes, the archive suffix has been updated or
+To accommodate those changes, the archive suffix has been updated or
 added:
 
 * for git: +-git4+