Code fence True and False strings (dotnet#5450)

Author: gewarren

xml/System/Boolean.xml

@@ -576,9 +576,9 @@ This method overrides <xref:System.Object.Equals%2A>.
 
 ## Remarks
 
-This field is equal to the string "False".
+This field is equal to the string `"False"`.
 
- The <xref:System.Boolean.FalseString> property defines the string representation of a `False` <xref:System.Boolean> value in formatting and parsing operations.
+The <xref:System.Boolean.FalseString> property defines the string representation of a `false` <xref:System.Boolean> value in formatting and parsing operations.
 
  ]]></format>
         </remarks>
@@ -1902,9 +1902,9 @@ The `provider` parameter is reserved. It does not participate in the execution o
 
 ## Remarks
 
-This field is equal to the string "True".
+This field is equal to the string `"True"`.
 
- The <xref:System.Boolean.TrueString> property defines the string representation of a `True` <xref:System.Boolean> value in formatting and parsing operations.
+The <xref:System.Boolean.TrueString> property defines the string representation of a `true` <xref:System.Boolean> value in formatting and parsing operations.
 
  ]]></format>
         </remarks>