Fixing broken link in engine readme (#177987)

Fixes: #177797

The engine readme had a broken link this PE fixes the broken link

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diff --git a/engine/src/flutter/shell/platform/android/test/README.md b/engine/src/flutter/shell/platform/android/test/README.md
index 8ec1448..31aa372 100644
--- a/engine/src/flutter/shell/platform/android/test/README.md
+++ b/engine/src/flutter/shell/platform/android/test/README.md
@@ -27,7 +27,7 @@
 
 Note that `testing/run_tests.py` does not build the engine binaries; instead they
 should be built prior to running this command and also when the source files
-change. See [Compiling the engine](https://github.com/flutter/flutter/wiki/Compiling-the-engine)
+change. See [Compiling the engine](https://github.com/flutter/flutter/blob/master/docs/engine/contributing/Compiling-the-engine.md)
 for details on how to do so.
 
 ## Q&A