Improve typing slightly

Author: gpotter2

scapy/layers/l2.py

@@ -895,14 +895,14 @@ def arpcachepoison(
 
 @conf.commands.register
 def arp_mitm(
-    ip1,  # type: str
-    ip2,  # type: str
+    ip1: str,
+    ip2: str,
     mac1=None,  # type: Optional[Union[str, List[str]]]
     mac2=None,  # type: Optional[Union[str, List[str]]]
-    broadcast=False,  # type: bool
-    target_mac=None,  # type: Optional[str]
-    iface=None,  # type: Optional[_GlobInterfaceType]
-    inter=3,  # type: int
+    broadcast: bool = False,
+    target_mac: Optional[str] = None,
+    iface: str = None,
+    inter: int = 3,
 ):
     # type: (...) -> None
     r"""ARP MitM: poison 2 target's ARP cache

scapy/layers/smbclient.py

@@ -1126,7 +1126,7 @@ def __init__(
         guest: bool = False,
         kerberos: bool = True,
         kerberos_required: bool = False,
-        HashNt: str = None,
+        HashNt: bytes = None,
         port: int = 445,
         timeout: int = 2,
         debug: int = 0,