Automatically port Decimal comments (EII) (#4023)

* Automatically port Decimal comments (EII)

* Apply suggestions from code review

Author: carlossanlop

xml/System/Decimal.xml

@@ -5406,10 +5406,26 @@
         <Parameter Name="value" Type="System.Object" Index="0" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.5;netstandard-1.6" />
       </Parameters>
       <Docs>
-        <param name="value">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <param name="value">The object to compare.</param>
+        <summary>Compares the current instance with another object of the same type and returns an integer that indicates whether the current instance precedes, follows, or occurs in the same position in the sort order as the other object.</summary>
+        <returns>A value that indicates the relative order of the objects being compared.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+This member is an explicit interface member implementation. It can be used only when the <xref:System.Decimal> instance is cast to an <xref:System.IComparable> interface.
+
+The return value has these meanings:
+
+| Value             | Meaning                                                                 |
+|-------------------|-------------------------------------------------------------------------|
+| Less than zero    | This instance precedes `value` in the sort order.                       |
+| Zero              | This instance occurs in the same position in the sort order as `value`. |
+| Greater than zero | This instance follows `value` in the sort order.                        |
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="System.IConvertible.GetTypeCode">
@@ -5439,9 +5455,17 @@
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
-        <remarks>To be added.</remarks>
+        <summary>Returns the <see cref="T:System.TypeCode" /> for this instance.</summary>
+        <returns>The enumerated constant that is the <see cref="T:System.TypeCode" /> of the class or value type that implements this interface.</returns>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Remarks
+
+This member is an explicit interface member implementation. It can be used only when the <xref:System.Decimal> instance is cast to an <xref:System.IConvertible> interface.
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <Member MemberName="System.IConvertible.ToBoolean">