docs: Fixed docker image name

Author: Julien Ruaux

README.adoc

@@ -112,7 +112,7 @@ docker-compose up
 .Create a RediSearch index
 [source,console]
 ----
-docker exec redismod /usr/local/bin/redis-cli FT.CREATE beers ON HASH PREFIX 1 beer: SCHEMA id TAG SORTABLE brewery_id TAG SORTABLE name TEXT SORTABLE abv NUMERIC SORTABLE descript TEXT style_name TAG SORTABLE cat_name TAG SORTABLE
+docker exec redis /usr/local/bin/redis-cli FT.CREATE beers ON HASH PREFIX 1 beer: SCHEMA id TAG SORTABLE brewery_id TAG SORTABLE name TEXT SORTABLE abv NUMERIC SORTABLE descript TEXT style_name TAG SORTABLE cat_name TAG SORTABLE
 ----
 
 .Add documents to the index