Remove the only 4 non-UTF8 characters in codebase

Relevant commit in old PR:
1b798a7042070cc8063bd341ebf7025da554b632

contrib/epee/include/net/local_ip.h

@@ -43,9 +43,9 @@ namespace epee
       ip = SWAP32LE(ip);
       /*
       local ip area
-      10.0.0.0 <EFBFBD> 10.255.255.255 
-      172.16.0.0 <EFBFBD> 172.31.255.255 
-      192.168.0.0 <EFBFBD> 192.168.255.255 
+      10.0.0.0 ... 10.255.255.255
+      172.16.0.0 ... 172.31.255.255
+      192.168.0.0 ... 192.168.255.255
       */
       if( (ip | 0xffffff00) == 0xffffff0a)
         return true;
@@ -70,7 +70,7 @@ namespace epee
       //MAKE_IP
       /*
       loopback ip
-      127.0.0.0 <EFBFBD> 127.255.255.255 
+      127.0.0.0 ... 127.255.255.255
       */
       return false;
     }