[docs] Use variable 'include_dirs' instead of 'includes‘

Change-Id: Ia34520291b32b986e3127f74b9270faf27532827
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/4820
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>

docs/reference.md

diff --git a/docs/reference.md b/docs/reference.md
index 1d2ea49..be887b9 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -1916,7 +1916,7 @@
 
 ```
   config("myconfig") {
-    includes = [ "include/common" ]
+    include_dirs = [ "include/common" ]
     defines = [ "ENABLE_DOOM_MELON" ]
   }
 

tools/gn/functions.cc

diff --git a/tools/gn/functions.cc b/tools/gn/functions.cc
index 7c54d17..34d539c 100644
--- a/tools/gn/functions.cc
+++ b/tools/gn/functions.cc
@@ -328,7 +328,7 @@
 Example
 
   config("myconfig") {
-    includes = [ "include/common" ]
+    include_dirs = [ "include/common" ]
     defines = [ "ENABLE_DOOM_MELON" ]
   }