[Docs] Fix email in design guidelines graphic

TBR=yangguo@chromium.org,bmeurer@chromium.org

Change-Id: I855544c72aefa0c6af68989fd078f7a1fb09c1f3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1913265
Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Michael Hablich <hablich@chromium.org>
diff --git a/docs/images/DevToolsDesignGuidelines.png b/docs/images/DevToolsDesignGuidelines.png
index 7244657..366ec05 100644
--- a/docs/images/DevToolsDesignGuidelines.png
+++ b/docs/images/DevToolsDesignGuidelines.png
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