doc: Add definition for ranged searches.
doc: Add definition for ranged searches.

Change-Id: I1be2dfdf51548a5d581184136ea1ad8cac7a3228

kernelci/kernelci-backend,joyxu/kernelci-backend,joyxu/kernelci-backend,joyxu/kernelci-backend,kernelci/kernelci-backend