Fix comment for Bp2buildDepsMutator config.

Test: presubmit
Change-Id: I5c7f1fc188eb37d3a457f9d4e2365d89ce2190e9
diff --git a/android/config.go b/android/config.go
index 622a672..524ff2f 100644
--- a/android/config.go
+++ b/android/config.go
@@ -297,8 +297,7 @@
 	// in tests when a path doesn't exist.
 	TestAllowNonExistentPaths bool
 
-	// If testAllowNonExistentPaths is true then PathForSource and PathForModuleSrc won't error
-	// in tests when a path doesn't exist.
+	// If true, register the "bp2build_deps" mutator in the mutator pipeline.
 	Bp2buildDepsMutator bool
 
 	// The list of files that when changed, must invalidate soong_build to