Add missing GRAMMAR_INLINE macro

Author: ntrel

book/dlang.org.ddoc

@@ -186,6 +186,7 @@ GNAME=<a id="$0">$(SPANC gname, $0)</a>
 GRAMMAR=$(TC pre, bnf notranslate, $0)
 GRAMMAR_INFORMATIVE=$(GRAMMAR $0)
 GRAMMAR_LEX=$(GRAMMAR $0)
+GRAMMAR_INLINE=$(TC tt, bnf notranslate, $0)
 GREEN=$(SPANC green, $0)
 GSELF=$(I $0)
 GT=&gt;