added docstring for the read() function

lib/wallet.py

@@ -676,6 +676,7 @@ class Wallet:
         os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 
     def read(self):
+        '''Read the contents of the wallet file.'''
         import interface
 
         upgrade_msg = """This wallet seed is deprecated. Please run upgrade.py for a diagnostic."""