add version

Author: gewarren

docs/core/project-sdk/msbuild-props.md

@@ -1431,7 +1431,7 @@ The following MSBuild properties are documented in this section:
 
 ### SdkAnalysisLevel
 
-The `SdkAnalysisLevel` property can be used to configure how *strict* SDK tooling is. It helps you manage SDK warning levels in situations where you might not be able to pin SDKs via *global.json* or other means. You can use this property to tell a newer SDK to behave as if it were an older SDK, with regards to a specific tool or feature, without having to install the older SDK.
+Introduced in .NET 9, the `SdkAnalysisLevel` property can be used to configure how *strict* SDK tooling is. It helps you manage SDK warning levels in situations where you might not be able to pin SDKs via *global.json* or other means. You can use this property to tell a newer SDK to behave as if it were an older SDK, with regards to a specific tool or feature, without having to install the older SDK.
 
 The allowed values of this property are SDK feature bands, for example, 8.0.100 and 8.0.400. The value defaults to the SDK feature band of the running SDK. For example, for SDK 9.0.102, the value would be 9.0.100. (For information about how the .NET SDK is versioned, see [How .NET is versioned](../versions/index.md).)