Fix HttpClient.DefaultRequestVersion property (#3359)

* Fix HttpClient.DefaultRequestVersion property

Update remarks for DefaultRequestVersion to show that it doesn't apply for HttpClient.SendAsync method.

Fixes https://github.com/dotnet/corefx/issues/41836

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

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

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

Co-Authored-By: Stephen Toub <[email protected]>

Author: 2 people

xml/System.Net.Http/HttpClient.xml

@@ -482,7 +482,9 @@ The environment variables used for `DefaultProxy` initialization on Windows and
 ## Remarks  
 `DefaultRequestVersion` is <xref:System.Net.HttpVersion.Version11?displayProperty=nameWithType> by default.
 
-The `DefaultRequestVersion` property specifies the default HTTP version to use for any requests sent using this <xref:System.Net.Http.HttpClient> instance, such as calls to <xref:System.Net.Http.HttpClient.GetAsync%2A>, <xref:System.Net.Http.HttpClient.GetStringAsync%2A>, or <xref:System.Net.Http.HttpClient.SendAsync%2A>.
+The `DefaultRequestVersion` property specifies the default HTTP version to use for requests sent using this <xref:System.Net.Http.HttpClient> instance when it constructs the <xref:System.Net.Http.HttpRequestMessage> to send, specifically with calls to methods such as <xref:System.Net.Http.HttpClient.DeleteAsync%2A>, <xref:System.Net.Http.HttpClient.GetAsync%2A>, <xref:System.Net.Http.HttpClient.GetByteArrayAsync%2A>, <xref:System.Net.Http.HttpClient.GetStreamAsync%2A>, <xref:System.Net.Http.HttpClient.GetStringAsync%2A>, <xref:System.Net.Http.HttpClient.PatchAsync%2A>, <xref:System.Net.Http.HttpClient.PostAsync%2A>, and <xref:System.Net.Http.HttpClient.PutAsync%2A>.
+
+The `DefaultRequestVersion` property doesn't apply to the <xref:System.Net.Http.HttpClient.SendAsync%2A> method. The <xref:System.Net.Http.HttpRequestMessage> parameter passed as the argument to the <xref:System.Net.Http.HttpClient.SendAsync%2A> method has its own `Version` property that controls the HTTP version used for the request.
 
 The `DefaultRequestVersion` property can be changed as long as the <xref:System.Net.Http.HttpClient> instance has not started any request.
  ]]></format>