More updates to documentation for uniq

Author: andrewdavidsmith

docs/content/uniq.md

@@ -41,6 +41,13 @@ $ dnmtools uniq -S duplicate-removal-stats.txt reads_sorted.bam reads_uniq.bam
 
 ## Options
 
+```txt
+ -t, -threads
+```
+The number of threads to use. These threads are used for I/O, and are
+most helpful when the input and output are both BAM, where the threads
+can really speed things up.
+
 ```txt
  -S, -stats
 ```