Manual: X carriage lacks two heat inserts

[Icenowy]

The current Trident manual (at commit 4d8b81a), at page 100, has a page of preparing the two parts of X carriage attached on the MGN12H carriage.
However, the Stealthburner manual (at commit 8285659a77016b63c2f27befe9a23f2907c28b3b) at page 59, shows the preparing of the same parts, with two more heat inserts, which are required to mount the Clockwork2 extruder. These two heat inserts are missing on Trident manual, which leads to me inserting them after the carriage is installed and belts fastened when following the Trident manual.