Gluster docs have poor search result quality

[sammcj]

For example, searching for the setting performance.parallel-readdir returns nothing:

Neither does parallel-readdir:

Although this is a valid configuration option:

gluster volume get test_static parallel-readdir
Option                                  Value
------                                  -----
performance.parallel-readdir            true

---

By contrast, searching for the setting network.ping-timeout does return something:

[nigelbabu]

Huh. That's weird. I could swear I fixed this to not use the RTD search. Assigning this to myself.