docs: make tense in command descriptions more consistent

subcommands/backup

@@ -13,7 +13,7 @@ service-backup-cmd() {
   #F -u|--use-iam, use the IAM profile associated with the current server
   #A service, service to run command against
   #A bucket-name, name of the s3 bucket to upload backups to
-  declare desc="creates a backup of the $PLUGIN_SERVICE service to an existing s3 bucket"
+  declare desc="create a backup of the $PLUGIN_SERVICE service to an existing s3 bucket"
   local cmd="$PLUGIN_COMMAND_PREFIX:backup" argv=("$@")
   [[ ${argv[0]} == "$cmd" ]] && shift 1
   declare SERVICE="$1" BUCKET_NAME="$2" USE_IAM_OPTIONAL_FLAG="$3"