Fixed typo in ibexa:install option description (#335) #1624

Job	Run time
Run code style check (8.0)	2m 37s
Unit tests & SQLite integration tests (7.4)	6m 33s
Unit tests & SQLite integration tests (8.0)	6m 31s
Unit tests & SQLite integration tests (8.1)	6m 25s
Solr integration tests (7.4)	9m 42s
Solr integration tests (8.0)	9m 53s
Solr integration tests (8.1)	9m 30s
PostgreSQL integration tests (7.4)	23m 1s
MySQL integration tests (7.4)	12m 45s
PostgreSQL integration tests (8.0)	19m 6s
MySQL integration tests (8.0)	12m 38s
PostgreSQL integration tests (8.1)	21m 14s
MySQL integration tests (8.1)	12m 46s
	2h 32m 41s

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