Automatically port Reflection.PortableExecutable.PdbChecksumDebugDirectoryData (#3194)

* Automatically port Reflection.PortableExecutable.PdbChecksumDebugDirectoryData

* addressed comments

Author: carlossanlop

xml/System.Reflection.PortableExecutable/PdbChecksumDebugDirectoryData.xml

@@ -20,8 +20,16 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>To be added.</summary>
-    <remarks>To be added.</remarks>
+    <summary>Represents a PDB Checksum debug directory entry.</summary>
+    <remarks>
+      <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+For more information, see: https://github.com/dotnet/corefx/blob/master/src/System.Reflection.Metadata/specs/PE-COFF.md#pdb-checksum-debug-directory-entry-type-19
+
+      ]]></format>
+    </remarks>
   </Docs>
   <Members>
     <Member MemberName="AlgorithmName">
@@ -41,9 +49,17 @@
         <ReturnType>System.String</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
-        <remarks>To be added.</remarks>
+        <summary>The name of the crypto hash algorithm used to calculate the checksum.</summary>
+        <value>A string representing the name of the crypto hash algorithm used to calculate the checksum.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+For example: "SHA256".
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="Checksum">
@@ -63,8 +79,8 @@
         <ReturnType>System.Collections.Immutable.ImmutableArray&lt;System.Byte&gt;</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>To be added.</summary>
-        <value>To be added.</value>
+        <summary>The checksum of the PDB content.</summary>
+        <value>An immutable array of bytes representing the checksum of the PDB content.</value>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>