Update UnitSystem.md

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 Description how to build units witht the D-SI format is [here](StructureSIUnits.md).
 
 ## SI base units of measurement (platinum units) 
-|D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI Reference| 
+|D-SI Identifier|D-SI Medal|SI name|SI symbol |SI Reference| 
 |-:|-:|-:|-:|-:| 
 |\metre|platinum|metre|m|[1, Table 2]| 
 |\kilogram<sup>(a</sup>|platinum|kilogram|kg|[1, Table 2]| 
@@ -14,7 +14,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(a: It is not allowed to use unit kilogram with a prefix. </sub>
 
 ## D-SI additional platinum units of measurement 
-|D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI Reference| 
+|D-SI Identifier|D-SI Medal|SI name|SI symbol |SI Reference| 
 |-:|-:|-:|-:|-:| 
 |\one<sup>(b</sup>|platinum|one|1|[1, Sec. 2.2.1]| 
 |\day|platinum|day|d|[1, Table 8]| 
@@ -27,7 +27,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(b: Unit one must not be used with a prefix of an exponent. </sub>
 
 ## SI derived units of measurement 
-|D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
+|D-SI Identifier|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
 |-:|-:|-:|-:|-:|-:|-:| 
 |\gram<sup>(c</sup>|gold|gram(a|g|10-3 kg|\kilogram|[1, Sec. 3]| 
 |\radian|gold|radian|rad|m/m|\metre\metre\tothe{-1}|[1, Table 4]| 
@@ -68,7 +68,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(g: Unit percent must not be used with a prefix of an exponent. </sub>
 
 ## Non-SI units of measurement allowed with the SI 
-|D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
+|D-SI Identifier|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
 |-:|-:|-:|-:|-:|-:|-:| 
 |\minute|silver|minute|min|s|\second|[1, Table 8]|
 |\hour|silver|hour|h|s|\second|[1, Table 8]|
@@ -91,7 +91,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(i: The unit decibel must not be combined with any prefix. </sub>
 
 ## SI prefixes decimal
-|D-SI Identifyer<sup>(j</sup>|D-SI Medal|SI name|SI symbol |Multiplyer|SI Reference|
+|D-SI Identifier<sup>(j</sup>|D-SI Medal|SI name|SI symbol |Multiplyer|SI Reference|
 |-:|-:|-:|-:|-:|-:|
 |\deca|gold|deca(a|da|10|[1, Table 7]|
 |\hecto|gold|hecto(a|h|100|[1, Table 7]|
@@ -125,7 +125,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(l: The prefix deci must not be combined with the unit bel. </sub>
 
 ## SI prefixes binary
-|D-SI Identifyer<sup>(m</sup>|D-SI Medal|SI name|SI symbol |Multiplyer|SI Reference|
+|D-SI Identifier<sup>(m</sup>|D-SI Medal|SI name|SI symbol |Multiplyer|SI Reference|
 |-:|-:|-:|-:|-:|-:|
 |\kibi|gold|kibi|Ki |1024|[1, p. 143]|
 |\mebi|gold|mebi|Mi|1048576|[1, p. 143]|
@@ -139,7 +139,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 <sub>(m: The binary prefixes are only allowed to be used with units bit and byte. </sub>
 
 ## Additional units from 8th edition of the SI-brochure 
-|D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
+|D-SI Identifier|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
 |-:|-:|-:|-:|-:|-:|-:| 
 |\clight|bronze|n.u. of speed|*c<sub>0</sub>*|m s-1|\metre\second\tothe{-1}|[3, Table 7]| 
 |\planckbar|bronze|n.u. of action and a.u. of action|*ħ*|J s|\joule\second|[3, Table 7]|
@@ -171,7 +171,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 
 
 ## Operators for combining units
-|D-SI Identifyer|Description|Examples|D-SI Medal |
+|D-SI Identifier|Description|Examples|D-SI Medal |
 |-:|-:|-:|-:|
 | |Multiplication: simply append one unit to another |\metre\metre|PLATINUM|
 |\tothe{n} | Exponent: following a unit where n is an integer or (+-)0.5 |\metre\tothe{2}, \second\tothe{-0.5}|PLATINUM|