Fix typo

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2370003002
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=2370003002

Review-Url: https://codereview.chromium.org/2370003002
diff --git a/site/dev/tools/debugger.md b/site/dev/tools/debugger.md
index 8a82287..1c5b7e0 100644
--- a/site/dev/tools/debugger.md
+++ b/site/dev/tools/debugger.md
@@ -18,7 +18,7 @@
 <!--?prettify lang=sh?-->
 
     # Build.
-    ninja -C out/Release/skiaserve
+    ninja -C out/Release skiaserve
 
     # Run the debugger locally
     out/Release/skiaserve