doc: Add missing keywords block and lambda

lht · marijnh · commit 2befca3966ce · 2011-11-01T09:25:37.000+01:00
diff --git a/doc/rust.texi b/doc/rust.texi
@@ -677,6 +677,8 @@ The keywords are:
 @tab @code{ret}
 @tab @code{be}
 @item @code{when}
+@tab @code{block}
+@tab @code{lambda}
 @end multitable
 
 @node       Ref.Lex.Res
