Fix typo in debug statement

Author: stevenpost

lib/puppet/provider/mongodb_replset/mongo.rb

@@ -280,7 +280,7 @@ def set_members
           Puppet.debug 'Replica set initialization has successfully ended'
           return true
         else
-          Puppet.debug "Wainting for replica initialization. Retry: #{n}"
+          Puppet.debug "Waiting for replica initialization. Retry: #{n}"
           sleep retry_sleep
           next
         end