Lang???.gf: exclude Documentation from present mode

The Documentation module is excluded from present mode in abstract/Lang.gf,
so it needs to be excluded in the corresponding concrete syntaxes too
to avoid problems.

lib/src/estonian/LangEst.gf

@@ -4,7 +4,7 @@ concrete LangEst of Lang =
   GrammarEst - [Slash2V3,SlashV2A,Slash3V3,SlashV2VNP,SlashVV], ---- to speed up compilation
   LexiconEst
   ,ConstructionEst
-  ,DocumentationEst
+  ,DocumentationEst --# notpresent
   ** {
 
 flags startcat = Phr ; unlexer = text ; lexer = finnish ;