Fix: minor comment cleanups (#343)

diff --git a/src/apps/wallets/manager.py b/src/apps/wallets/manager.py
index e80ce81..2500a74 100644
--- a/src/apps/wallets/manager.py
+++ b/src/apps/wallets/manager.py
@@ -329,7 +329,7 @@ class WalletManager(BaseApp):
         Returns dict with options to pass to sign_psbtview function.
         """
 
-        # ask the user if he wants to sign with custom sighashes
+        # ask the user if they want to sign with custom sighashes
         sighash = await self.confirm_sighashes(meta, show_screen)
         if sighash == False:
             return
@@ -406,7 +406,7 @@ class WalletManager(BaseApp):
         if not used_custom_sighashes:
             return None
 
-        # ask the user if he wants to sign in case of non-default sighashes
+        # ask the user if they want to sign in case of non-default sighashes
         custom_sighashes = [
                 ("Input %d: %s" % (i, inp.get("sighash", sighash_name)))
                 for (i, inp) in enumerate(meta["inputs"])
diff --git a/src/hosts/usb.py b/src/hosts/usb.py
index b4101ba..9566d56 100644
--- a/src/hosts/usb.py
+++ b/src/hosts/usb.py
@@ -115,7 +115,7 @@ class USBHost(Host):
         # if not - create new file on the ramdisk
         if self.f is None:
             self.f = open(self.path + "/data", "wb")
-        # check if we dont have EOL in the data
+        # check if we don't have EOL in the data
         if b"\n" not in res and b"\r" not in res:
             self.f.write(res)
             return