Clarify version match constraint in Package-Versioning.md (#3398)

Author: DAnikeyev

docs/concepts/Package-Versioning.md

@@ -132,6 +132,9 @@ Avoid specifying an upper bound to version ranges to packages you don't own unle
      Will resolve to the highest acceptable stable version.-->
 <PackageReference Include="ExamplePackage" Version="6.*" />
 
+<!-- Accepts only version 6.1.0. -->
+<PackageReference Include="ExamplePackage" Version="[6.1.0]" />
+
 <!-- Accepts any version above, but not including 4.1.3. Could be
      used to guarantee a dependency with a specific bug fix. 
      Will resolve to the smallest acceptable stable version.-->