Small Typo in page text.

[frankbjr]

if they traverse from a target up the tree to the root, and are said to "tunnel" if THAT start at the root and traverse down to a target.

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• ID: c08cf280-bb74-6eab-3475-b42508967afc
• Version Independent ID: 2dfcc4dd-6241-84d6-994a-413a54a259ff
• Content: WPF Architecture
• Content Source: docs/framework/wpf/advanced/wpf-architecture.md
• Product: dotnet-framework
• GitHub Login: @dotnet-bot
• Microsoft Alias: dotnetcontent