【Hackathon 6th No.3】修改rfc (#906)

* add rfcs

* update

* update

Author: ADream-ki

rfcs/APIs/20240421_api_design_for_zeropad1d_zeropad3d_block_diag.md

@@ -281,7 +281,7 @@ class ZeroPad3D(Layer):
 
 ```python
 
-def block_diag(*inputs, name=None):
+def block_diag(inputs, name=None):
     def to_col_block(arys, i, a):
         return [
             a if idx == i else paddle.zeros([ary.shape[0], a.shape[1]], dtype=a.dtype)