Shuffle 'docs' directories

As part of the tint -> dawn merge.

Bug: dawn:1275
Change-Id: Ice0c9d2f03f6d7e96471cf8398aecd16273c833f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/78400
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/dawn_wire.json b/dawn_wire.json
index 869f74b..226321e 100644
--- a/dawn_wire.json
+++ b/dawn_wire.json
@@ -15,7 +15,7 @@
         "limitations under the License."
     ],
 
-    "_doc": "See docs/codegen.md",
+    "_doc": "See docs/dawn/codegen.md",
 
     "commands": {
         "buffer map async": [