[docs] GN can tell empty lists from non empty lists

Change-Id: Id5f067f94f853d45602331d4d86852061f1a5163
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/5400
Reviewed-by: Brett Wilson <brettw@google.com>
Commit-Queue: Brett Wilson <brettw@google.com>

docs/language.md

diff --git a/docs/language.md b/docs/language.md
index dcc6c9e..16cb2a4 100644
--- a/docs/language.md
+++ b/docs/language.md
@@ -95,9 +95,9 @@
 
 ### Lists
 
-There is no way to get the length of a list. If you find yourself
-wanting to do this kind of thing, you're trying to do too much work in
-the build.
+Aside from telling empty lists from non empty lists (`a == []`), there is no
+way to get the length of a list. If you find yourself wanting to do this kind
+of thing, you're trying to do too much work in the build.
 
 Lists support appending: