Remove link to missing script (#41987)

Author: mccoyp

doc/dev/mgmt/multiapi.md

@@ -105,7 +105,6 @@ o
 
 - There is as many folder per API versions we want to ship
 - The files in the API version folders are generated by Autorest
-- The files are the root (here `azure/mgmt/network`) are generated by the script [multiapi_init_gen.py](https://github.com/Azure/azure-sdk-for-python/blob/main/scripts/multiapi_init_gen.py)
 
 ## Complicated scenarios