Fix some typos in Soong.

Test: m
Change-Id: I032b6ce2a61491b88416db9943b42e6af4783459
diff --git a/apex/apex.go b/apex/apex.go
index 13e4fb7..4debe25 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1364,7 +1364,7 @@
 	})
 
 	// b/143654022 Q apexd can't understand newly added keys in apex_manifest.json
-	// prepare stripp-downed version so that APEX modules built from R+ can be installed to Q
+	// prepare stripped-down version so that APEX modules built from R+ can be installed to Q
 	a.manifestJsonOut = android.PathForModuleOut(ctx, "apex_manifest.json")
 	ctx.Build(pctx, android.BuildParams{
 		Rule:   stripApexManifestRule,