Merge branch 'geo-doc-fix' into 'master'

Fix TYPO in Geo development Doc

See merge request gitlab-org/gitlab-ee!3243

doc/development/geo.md

@@ -172,7 +172,7 @@ The database configuration is set in `config/database_geo.yml`.
 To write a migration for the database, use the `GeoMigrationGenerator`:
 
 ```
-rails g geo_generation [args] [options]
+rails g geo_migration [args] [options]
 ```
 
 To migrate the tracking database, run: