Apply suggestions from code review

Co-authored-by: François Parmentier <francois.parmentier@gmail.com>

services/text-clustering/v1/clustering.ini

@@ -31,7 +31,7 @@ post.parameters.2.required = false
 post.parameters.3.in = query
 post.parameters.3.name = nbCluster
 post.parameters.3.schema.type = number
-post.parameters.3.description = Number of cluster returned
+post.parameters.3.description = Number of clusters returned
 
 [env]
 path = generator