Update IntelliSense package (#60487)

* Update IntelliSense package

* Fixed package version
Co-authored-by: Ncarlossanlop <carlossanlop@users.noreply.github.com>

eng/Versions.props

@@ -167,7 +167,7 @@
     <SdkVersionForWorkloadTesting>6.0.100-rc.2.21474.31</SdkVersionForWorkloadTesting>
     <CompilerPlatformTestingVersion>1.1.1-beta1.21467.5</CompilerPlatformTestingVersion>
     <!-- Docs -->
-    <MicrosoftPrivateIntellisenseVersion>6.0.0-preview-20210916.1</MicrosoftPrivateIntellisenseVersion>
+    <MicrosoftPrivateIntellisenseVersion>6.0.0-preview-20211019.1</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
     <MicrosoftNETILLinkTasksVersion>7.0.100-1.21513.1</MicrosoftNETILLinkTasksVersion>
     <MicrosoftNETILLinkAnalyzerPackageVersion>$(MicrosoftNETILLinkTasksVersion)</MicrosoftNETILLinkAnalyzerPackageVersion>