Units must not be written in brackets.

[PhRosenberger]

Describe the bug

As stated in DIN 1313, units must not be written in brackets, but unfortunately, this is the case in the documentation.
Further information: Rohde & Schwarz: Der korrekte Umgang mit Größen, Einheiten und Gleichungen
Reference: ISO 80000-1: 2009, Quantities and units – Part 1: General

Describe how to reproduce the bug

The mistake can be seen in the whole documentation.