submodule: update specification - simplify handbook category

Guo-Zhang · Guo-Zhang · commit 51d8e09892b5 · 2026-04-08T20:44:34.000+08:00
diff --git a/docs/specification b/docs/specification
@@ -1 +1 @@
-Subproject commit d9c1c71edc53a2f05d330c6963ea1b3082daef31
+Subproject commit 755949700c439df4eb34b39bab834b49a66d877e
