Add "preliminary" comment to hindi_compact subtype

Hindi (Compact) input should be marked as "preliminary" until a
combining input logic for that subtype is implemented.

Bug: 13779052
Change-Id: Iae5be2cc24507d7533ca1dd56b18cd80818a8cf1

java/res/xml/method.xml

@@ -49,7 +49,7 @@
     fr_CH: French (Switzerland)/swiss
     gl_ES: Galician (Spain)/spanish
     hi: Hindi/hindi
-    hi: Hindi/hindi_compact
+    (hi: Hindi/hindi_compact) # This is a preliminary keyboard layout.
     hr: Croatian/qwertz
     hu: Hungarian/qwertz
     hy_AM: Armenian (Armenia) Phonetic/armenian_phonetic