Merge branch '9228-geo-how-to-reconcile-differences-with-geo-checksum-mismatches-docs' into 'master'

Document how to reconcile differences with Geo checksum mismatches

Closes gitlab-ee#9228

See merge request gitlab-org/gitlab-ce!28183

(cherry picked from commit dbc0f8c1)

ecfadcfb Document how to reconcile differences with Geo checksum mismatches
8d3c42c3 Apply suggestion to doc/administration/geo/disaster_recovery/background_verification.md
71757a82 Apply suggestion to doc/administration/geo/disaster_recovery/background_verification.md
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ea8e7bd8 Apply suggestion to doc/administration/geo/disaster_recovery/background_verification.md
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dcc949a4 Apply suggestion to doc/administration/geo/disaster_recovery/background_verification.md
911fc185 Fix fenced code blocks