FAQ/Linux: Add anchor for manual setup of libinput quirks

Author: gonX

site/_wiki/FAQ/Linux.md

@@ -130,7 +130,7 @@ otd-daemon
 ## The cursor feels slow on Artist Mode {#libinput-smoothing}
 
 If you are using a release version of OpenTabletDriver v0.6.4.0 or older, this
-is expected, and a workaround exists.
+is expected, and a workaround exists [below](#libinput-smoothing-on-old-versions).
 
 On newer versions, this is fixed in new packaging - please report a bug to your
 packager if the quirks file is not included with your OpenTabletDriver package.
@@ -145,7 +145,7 @@ Figuring out the path is left as an exercise for the reader, but it is
 typically one of the **newest** (not necessarily highest numbered) `event##`
 device in `/dev/input/`.
 
-### With OpenTabletDriver Version 0.6.4.0 or earlier (and `master`/0.7 branch builds)
+### With OpenTabletDriver Version 0.6.4.0 or earlier (and `master`/0.7 branch builds) {#libinput-smoothing-on-old-versions}
 
 With OpenTabletDriver v0.6.4.0 and earlier (and v0.7 builds), using Artist Mode
 will result in some minor smoothing due to libinput's tablet handling, for