docs: fix broken custom type array parameter links
docs: fix broken custom type array parameter links

When a documented parameter was an array of a custom type, e.g:

  @param {module:pubsub/topic[]} callback.topics

The resulting link in the docs wasn't working:

  <a href="docs/master/pubsub/topic[]">

This replaces the empty brackets from the link, so that we get:

  <a href="docs/master/pubsub/topic">

pcostell/gcloud-node,mziccard/gcloud-node,nemo/gcloud-node,pcostell/gcloud-node,authbox-lib/gcloud-node,stephenplusplus/gcloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,savethefails/gcloud-node,googleapis/google-cloud-node,Muffasa/gcloud-node,GoogleCloudPlatform/gcloud-node,callmehiphop/gcloud-node-ghpages,savethefails/gcloud-node,VikramTiwari/gcloud-node,jcking/google-cloud-node,authbox-lib/gcloud-node,chrishiestand/gcloud-node,Muffasa/gcloud-node,authbox-lib/gcloud-node,t9nf/gcloud-node,t9nf/gcloud-node,jcking/google-cloud-node,tcrognon/google-cloud-node,callmehiphop/gcloud-node,GoogleCloudPlatform/gcloud-node,jgeewax/gcloud-node,nemo/gcloud-node,jgeewax/gcloud-node,ofrobots/google-cloud-node,chrishiestand/gcloud-node,chrishiestand/gcloud-node,Muffasa/gcloud-node,mziccard/gcloud-node,VikramTiwari/gcloud-node,stephenplusplus/gcloud-node,SimpleEmotion/gcloud-node,callmehiphop/gcloud-node-ghpages,VikramTiwari/gcloud-node,nemo/gcloud-node,stephenplusplus/gcloud-node,jmptrader/gcloud-node,jmptrader/gcloud-node,tcrognon/google-cloud-node,savethefails/gcloud-node,SimpleEmotion/gcloud-node,ofrobots/google-cloud-node,SimpleEmotion/gcloud-node,callmehiphop/gcloud-node,pcostell/gcloud-node,googleapis/google-cloud-node,GoogleCloudPlatform/gcloud-node,t9nf/gcloud-node,jcking/google-cloud-node,ofrobots/google-cloud-node