Describe the doc issue

https://docs.opencv.org/4.x/d3/d6c/classcv_1_1dnn_1_1Layer.html#a16e8d282842ce091953dbcf181d2facb
or
https://docs.opencv.org/4.x/d3/d6c/classcv_1_1dnn_1_1Layer.html#a45db2ad86a84737afa623976a957a7e6

what does it mean "If this method is called after network has allocated all memory for input and output blobs and before inferencing. " ?

Without "if" I understand with "if" somethng is missing?

Fix suggestion

Remove "if"