Follow alias function naming conventions

xonsh/rc.xsh

@@ -62,7 +62,8 @@ if ON_DARWIN:
 if ON_LINUX:
     aliases["pulsefix"] = "pulseaudio --kill; pulseaudio --start"
 
-def find_venv():
+def _vv():
+    """Finds the nearest venv going upward in the directory hierarchy and activates it."""
     d = Path.cwd()
 
     while True:
@@ -77,7 +78,7 @@ def find_venv():
         d = d.parent
 
 
-aliases["vv"] = find_venv
+aliases["vv"] = _vv
 
 # # Hybrid Vi Mode
 # set -g fish_key_bindings hybrid_bindings