cosmetic: 1)typos 2)parameters named for clarity

Test: n/a
Bug: n/a
Change-Id: I49faa1d8dec4b729409a45e87212b271ecf9e9d1
diff --git a/android/variable.go b/android/variable.go
index 40dd2d8..ff77fef 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -129,7 +129,7 @@
 			Exclude_srcs []string
 		}
 
-		// eng is true for -eng builds, and can be used to turn on additionaly heavyweight debugging
+		// eng is true for -eng builds, and can be used to turn on additional heavyweight debugging
 		// features.
 		Eng struct {
 			Cflags   []string