correct install.package call in mcq.read.metadata.Rd example

MCQR/man/mcq.read.metadata.Rd

@@ -28,7 +28,7 @@ For the good working of MCQR functions, the following columns names are forbidde
 
   # Load the 'dataverse' library to retrieve the example data
   if("dataverse" \%in\% installed.packages()){
-      install.packages("dataverse", repository="https://cloud.r-project.org/")
+      install.packages("dataverse", repos="https://cloud.r-project.org/")
     }
   library(dataverse)