Update NU5048.md

Author: karann-msft

docs/reference/errors-and-warnings/NU5048.md

@@ -15,15 +15,15 @@ f1_keywords:
 <pre>The 'PackageIconUrl'/'iconUrl' element is deprecated. Consider using the 'PackageIcon'/'icon' element instead. Learn more at https://aka.ms/deprecateIconUrl</pre>
 
 
-# Issue
+### Issue
 
 Icon URL is deprecated in favor of embedding the icon inside the NuGet package. Possible causes are:
 
 - When creating a package from a nuspec file, it contains a `<iconUrl/>` entry.
 - When creating a package from a MSBuild project file, it contains a `<PackageIconUrl>` property.
 
 
-# Solution
+### Solution
 
 To stop seeing this warning, add an embedded icon to your package.
 
@@ -32,11 +32,15 @@ For MSBuild project files, add an `<PackageIcon/>` property, as follows:
 ```xml
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
-    <PackageIcon>icon.jpg</PackageIcon>
+      ...
+      <PackageIcon>icon.png</PackageIcon>
+      ...
   </PropertyGroup>
+
   <ItemGroup>
-    <None Include="icon.jpg" Pack="true" PackagePath="" />
+      ...
+      <None Include="images\icon.png" Pack="true" PackagePath=""/>
+      ...
   </ItemGroup>
 </Project>
 ```
@@ -58,4 +62,4 @@ For nuspec files, add an `<icon/>` entry that points to the file that will be th
 </package>
 ```
 
-To learn more about embedded icons in NuGet and the Icon URL deprecation efforts, see https://aka.ms/deprecateIconUrl 
+[Learn more about packaging an icon image file](../msbuild-targets.md#packing-an-icon-image-file).