Refine Unicode normalization paragraph in User Guide (#19898)
Fix-up of #19608
Summary of the issue:
With the introduction of #19608, the logic of the Unicode normalization paragraph in the User Guide has been broken. Namely, the information regarding additional (non-NFKC) normalization has been added as a bullet in the list of NVKC benefits.
Description of user facing changes:
Unicode normalization paragraph modified / updated.
