spelling: reference

Author: jsoref

doc/command-line-flags.md

@@ -151,7 +151,7 @@ See also: [`concurrent-migrations`](cheatsheet.md#concurrent-migrations) on the
 
 ### skip-foreign-key-checks
 
-By default `gh-ost` verifies no foreign keys exist on the migrated table. On servers with large number of tables this check can take a long time. If you're absolutely certain no foreign keys exist (table does not referenece other table nor is referenced by other tables) and wish to save the check time, provide with `--skip-foreign-key-checks`.
+By default `gh-ost` verifies no foreign keys exist on the migrated table. On servers with large number of tables this check can take a long time. If you're absolutely certain no foreign keys exist (table does not reference other table nor is referenced by other tables) and wish to save the check time, provide with `--skip-foreign-key-checks`.
 
 ### skip-renamed-columns