Gaps between IFC 4.0.2.1 type definitions and sounds measure units in documentation

[ocdnamib]

Ifc Defined Type entity name		type definition	https://github.com/buildingSMART/IDS/blob/master/Documentation/units.md/Physical Quantity description	https://github.com/buildingSMART/IDS/blob/master/Documentation/units.md/Unit	https://github.com/buildingSMART/IDS/blob/master/Documentation/units.md/Unit Symbol
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcmeasureresource/lexical/ifcsoundpowerlevelmeasure.htm	Sound Power Level	A sound power level measure is a measure of total radiated noise with units of decibels with a reference value of picowatts.
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcmeasureresource/lexical/ifcsoundpowermeasure.htm	Sound Power	A sound power measure is a measure of total radiated noise with units of watts (sonic energy per time unit).	Sound power	decibel	db
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcmeasureresource/lexical/ifcsoundpressurelevelmeasure.htm	Sound Pressure Level	A sound pressure level measure is a measure of the pressure fluctuations superimposed over the ambient pressure level with units of decibels with a reference value of micropascals.
https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcmeasureresource/lexical/ifcsoundpressuremeasure.htm	Sound Pressure	A sound pressure measure is a measure of the pressure fluctuations superimposed over the ambient pressure level with units of pascals.	Sound pressure	decibel	db

[CBenghi]

Probably resolved with #411