Add properties CopyDebugSymbolFilesFromPackages and CopyDocumentationFilesFromPackages (#8621)

Related to a new feature (consuming pdbs/documents from packages), which was brought in in .NET 7.
PR from sdk: dotnet/sdk#27580

Document the `CopyDebugSymbolFilesFromPackages`  and `CopyDocumentationFilesFromPackages` properties.

Author: heng-liu

src/MSBuild/MSBuild/Microsoft.Build.CommonTypes.xsd

@@ -1730,6 +1730,20 @@ elementFormDefault="qualified">
         <xs:documentation><!-- _locID_text="GenerateDocumentationFile" _locComment="" -->Value indicating whether a documentation file will be generated by the compiler</xs:documentation>
       </xs:annotation>
     </xs:element>
+    <xs:element name="CopyDebugSymbolFilesFromPackages" type="msb:boolean" substitutionGroup="msb:Property">
+        <xs:annotation>
+            <xs:documentation>
+                <!-- _locID_text="CopyDebugSymbolFilesFromPackages" _locComment="" -->Value indicating whether symbol files will be copied from NuGet packages by the compiler
+            </xs:documentation>
+        </xs:annotation>
+    </xs:element>
+    <xs:element name="CopyDocumentationFilesFromPackages" type="msb:boolean" substitutionGroup="msb:Property">
+        <xs:annotation>
+            <xs:documentation>
+                <!-- _locID_text="CopyDocumentationFilesFromPackages" _locComment="" -->Value indicating whether documentation files will be copied from NuGet packages by the compiler
+            </xs:documentation>
+        </xs:annotation>
+    </xs:element>
     <xs:element name="GenerateManifests" type="msb:StringPropertyType" substitutionGroup="msb:Property"/>
     <xs:element name="GenerateLibraryLayout" type="msb:boolean" substitutionGroup="msb:Property"/>
     <xs:element name="GeneratePackageOnBuild" type="msb:boolean" substitutionGroup="msb:Property">