libbinder: document not to use TextOutput

Removing these completely is infeasible/not worth it for now, but we can
at least hint that they shouldn't be used so that those who look into
the file won't think it should be used.

Bug: 148676615
Test: N/A
Change-Id: Icd69c932b290d6df6de199bbc94f2024445edf33
diff --git a/libs/binder/include/binder/TextOutput.h b/libs/binder/include/binder/TextOutput.h
index f66406f..c7e1e14 100644
--- a/libs/binder/include/binder/TextOutput.h
+++ b/libs/binder/include/binder/TextOutput.h
@@ -50,12 +50,18 @@
 
 // ---------------------------------------------------------------------------
 
+// DO NOT USE: prefer libutils/libbase logs, which don't require static data to
+// be allocated.
 // Text output stream for printing to the log (via utils/Log.h).
 extern TextOutput& alog;
 
+// DO NOT USE: prefer libutils/libbase logs, which don't require static data to
+// be allocated.
 // Text output stream for printing to stdout.
 extern TextOutput& aout;
 
+// DO NOT USE: prefer libutils/libbase logs, which don't require static data to
+// be allocated.
 // Text output stream for printing to stderr.
 extern TextOutput& aerr;