Update HttpRequestMessage version for 3.0 (#3285)

* Update HttpRequestMessage.xml

* Update HttpRequestMessage.xml

Playing around with formatting.

* Update xml/System.Net.Http/HttpRequestMessage.xml

Co-Authored-By: Maira Wenzel <[email protected]>

* Apply suggestions from code review

Co-Authored-By: Maira Wenzel <[email protected]>

* Update HttpRequestMessage.xml

* Update HttpRequestMessage.xml

* Update HttpRequestMessage.xml

* Update HttpRequestMessage.xml

* Update xml/System.Net.Http/HttpRequestMessage.xml

Co-Authored-By: Maira Wenzel <[email protected]>

* Update xml/System.Net.Http/HttpRequestMessage.xml

Co-Authored-By: Maira Wenzel <[email protected]>

* Update HttpRequestMessage.xml

Author: Thraka

xml/System.Net.Http/HttpRequestMessage.xml

@@ -461,8 +461,29 @@
       </ReturnValue>
       <Docs>
         <summary>Gets or sets the HTTP message version.</summary>
-        <value>The HTTP message version. The default in the .NET Framework and earlier versions of .NET Core is 1.1. In .NET Core 2.1 and later, it is 2.0.</value>
-        <remarks>Starting with .NET  Core 2.1, the default value of the `Version` property changed from 1.1 to 2.0.</remarks>
+        <value>The HTTP message version. The default value is <c>1.1</c>, unless you're targeting .NET Core 2.1 or 2.2. In that case, the default value is <c>2.0</c>.</value>
+        <remarks>
+          <format type="text/markdown"><![CDATA[  
+          
+## Remarks
+
+In .NET Core, the default message version differs based on the version you're using. .NET Core 2.1 changed the default value from `1.1` to `2.0`. In .NET Core 3.0, the default value was reverted back to `1.1`.
+
+### .NET Framework
+
+The default message version is `1.1`.
+
+### .NET Core
+
+The following table lists the default message version based on the version of .NET Core:
+
+| .NET Core version           | HTTP request version |
+| --------------------------- | -------------------- |
+| 2.1<br/>2.2                 | `2.0`                |
+| Any other .NET Core version | `1.1`                |
+
+ ]]></format>
+        </remarks>
       </Docs>
     </Member>
   </Members>