Fix TargetFrameworks documentation - correct precedence behavior (#49607)

* Initial plan

* Fix TargetFrameworks documentation note

The note incorrectly stated that TargetFrameworks property is ignored if TargetFramework is specified. The actual behavior is the opposite - when both properties are present, TargetFrameworks (plural) takes precedence and TargetFramework (singular) is ignored.

Updated the note to correctly reflect this behavior.

Fixes #45942

Co-authored-by: gewarren <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: gewarren <[email protected]>

Author: Copilot

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

@@ -114,7 +114,7 @@ For more information, see [Target frameworks in SDK-style projects](../../standa
 Use the `TargetFrameworks` property when you want your app to target multiple platforms. For a list of valid target framework monikers, see [Target frameworks in SDK-style projects](../../standard/frameworks.md#supported-target-frameworks).
 
 > [!NOTE]
-> This property is ignored if `TargetFramework` (singular) is specified.
+> If `TargetFrameworks` (plural) is specified, `TargetFramework` (singular) is ignored.
 
 ```xml
 <PropertyGroup>