Update Guidelines(8th Edition).xml (#184)

Author: Keboo

docs/Guidelines(8th Edition).xml

@@ -203,7 +203,6 @@
   <guideline key="Ch06_95f0537" severity="DO" section="Coding" subsection="Properties">DO implement non-nullable reference-type automatically implemented properties as read-only.</guideline>
   <guideline key="Ch06_b85aa4e" severity="DO" section="Coding" subsection="Properties">DO assign non-nullable reference-type properties before instantiation completes.</guideline>
   <guideline key="Ch06_759b766" severity="DO" section="Coding" subsection="Properties">"DO implement non-nullable read/write reference fully implemented properties with a nullable backing field, a null-forgiveness operator when returning the field from the getter, and non-null validation in the property setter."</guideline>
-  <guideline key="Ch06_34774e8" severity="DO" section="Coding" subsection="Properties">"DO allow properties to be set in any order, even if this results in a temporarily invalid object state."</guideline>
   <guideline key="Ch04_2dc14f6" severity="DO" section="Coding" subsection="Strings">DO favor composite formatting over use of the addition operator for concatenating strings when localization is a possibility.</guideline>
   <guideline key="Ch09_6d059d3" severity="DO NOT" section="Coding" subsection="Structs">"DO NOT define a struct unless it logically represents a single value, consumes 16 bytes or less of storage, is immutable, and is infrequently boxed."</guideline>
   <guideline key="Ch09_be07b3a" severity="DO" section="Coding" subsection="Structs">DO ensure that the default value of a struct is valid; encapsulation cannot prevent obtaining the default “all zero” value of a struct.</guideline>
@@ -250,4 +249,4 @@
   <guideline severity="CONSIDER" section="Coding" subsection="Variables">CONSIDER using target-typed new expressions any time that the instance clearly shows its type.</guideline>
   <guideline key="Ch04_9fa9f67" severity="AVOID" section="Coding" subsection="Whitespace">"AVOID omitting braces, except for the simplest of single-line if statements."</guideline>
   <guideline key="Ch04_19bd2d2" severity="DO" section="Coding" subsection="Whitespace">"DO use parentheses to make code more readable, particularly if the operator precedence is not clear to the casual reader."</guideline>
-</Guidelines>
+</Guidelines>