These document talk about multiplication order about FTransform and opposite order each other.

From FQuat:
Example: LocalToWorld = (LocalToWorld * DeltaRotation) will change rotation in local space by DeltaRotation.

From FTransform:
Example: LocalToWorld = (DeltaRotation * LocalToWorld) will change rotation in local space by DeltaRotation.
HERE ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sometime document is not so clear. I suggest QnA or suggestion/report linked with official document.

Please refer to the line before the ones that you referenced:

FQuat:

Order matters when composing quaternions: C = A * B will yield a quaternion C that logically first applies B then A to any subsequent transformation (right first, then left). Note that this is the opposite order of FTransform multiplication.

FTransform:

Order matters when composing transforms: C = A * B will yield a transform C that logically first applies A then B to any subsequent transformation. Note that this is the opposite order of quaternion (FQuat) multiplication.

This explains that these are intended to be the opposite of each other and are meant to be this way.