Remove duplicated "By default" in docs

docsite/rst/intro_inventory.rst

@@ -216,7 +216,7 @@ mentioned::
     ansible_ssh_private_key_file
       Private key file used by ssh.  Useful if using multiple keys and you don't want to use SSH agent.
     ansible_shell_type
-      The shell type of the target system. By default commands are formatted using 'sh'-style syntax by default. Setting this to 'csh' or 'fish' will cause commands executed on target systems to follow those shell's syntax instead.
+      The shell type of the target system. Commands are formatted using 'sh'-style syntax by default. Setting this to 'csh' or 'fish' will cause commands executed on target systems to follow those shell's syntax instead.
     ansible_python_interpreter
       The target host python path. This is useful for systems with more
       than one Python or not located at "/usr/bin/python" such as \*BSD, or where /usr/bin/python