broken link fixed in epc setup tutorial

docs/tutorials/epc-setup.md

@@ -105,7 +105,7 @@ from an upstream router it's connected to (as your computer usually does when yo
 The "downstream" ethernet interface (enp4s0) connected to the eNB is assigned two IP addresses and
 subnets, which are configured statically (_not_ by DHCP, hence the `dhcp4: no`).
 In our case, we need this interface to talk to the Baicells Nova 233 eNB we use.
-Our eNB has the default local (LAN) IP address of `192.168.150.1`. We also need to set its WAN address (for whatever reason this is required to be different) to `192.168.151.1`, as in [this eNB setup tutorial](https://docs.seattlecommunitynetwork.org/infrastructure/sas-setup.html). That's why we have the `addresses:` section that sets the static IP addresses of the EPC to `192.168.150.2/24` and `192.168.151.2/24`. Since these IP addresses are in the same subnet as the eNB IP addresses, they will be able to talk to each other automatically _without a router in between_ helping to route communications packets between the two addresses.
+Our eNB has the default local (LAN) IP address of `192.168.150.1`. We also need to set its WAN address (for whatever reason this is required to be different) to `192.168.151.1`, as in [this eNB setup tutorial](https://docs.seattlecommunitynetwork.org/infrastructure/sas-setup). That's why we have the `addresses:` section that sets the static IP addresses of the EPC to `192.168.150.2/24` and `192.168.151.2/24`. Since these IP addresses are in the same subnet as the eNB IP addresses, they will be able to talk to each other automatically _without a router in between_ helping to route communications packets between the two addresses.
 
 Below we also provide an alternate configuration in case you do not yet have a
 machine with 2 ethernet ports or a USB to ethernet adapter dongle. However, only