docs(stdlib_linalg): add description of 'Class' as Pure function for diagonal array operations.

zoziha · zoziha · commit 29cf716d30ce · 2025-04-21T09:28:29.000+08:00
diff --git a/doc/specs/stdlib_linalg.md b/doc/specs/stdlib_linalg.md
@@ -187,6 +187,10 @@ to the original.
 
 Stable
 
+### Class
+
+Pure function.
+
 ### Description
 
 Create a diagonal array or extract the diagonal elements of an array
