RGLBaseHin added ; DocumentationHin in LangHin so that it gets compiled in RGL

src/hindi/LangHin.gf

@@ -1,8 +1,9 @@
---# -path=.:../abstract:../common:../hindustani
+--# -path=.:../abstract:../common:../hindustani:../api
 
 concrete LangHin of Lang = 
   GrammarHin,
   LexiconHin
+ , DocumentationHin
   ** {
 
 flags startcat = Phr ; unlexer=unwords ; lexer=words ;