Fix a typo

IPython/core/interactiveshell.py

@@ -703,7 +703,7 b' class InteractiveShell(SingletonConfigurable):'
         # In Cygwin paths like "c:\..." and '\cygdrive\c\...' are possible
         if p_venv.startswith('\\cygdrive'):
             p_venv = p_venv[11:]
-        else if p_venv[1] == ':':
+        elif p_venv[1] == ':':
             p_venv = p_venv[2:]
 
         if any(p_venv in p for p in paths):