Removed --encryptionkey from the docs

doc/latex/CTA_Admin_Start.tex

@@ -76,7 +76,7 @@ The library and tapes need to be registered for the migrations (use appropriate
   $ cta tapepool add --name ctasystest --partialtapesnumber 5 --encrypted false --comment "ctasystest"  
 # add tape to the tapepool and library
   $ cta tape add --logicallibrary VLSTK --tapepool ctasystest --capacity 1000000000 \
-  --comment "ctasystest" --vid V31001 --disabled false --full false --encryptionkey test
+  --comment "ctasystest" --vid V31001 --disabled false --full false
 # create storage class
   $ cta storageclass add --instance root --name ctaStorageClass --copynb 1 --comment "ctasystest"
 # create archive route