[docs] definition of expression_nocond and lambda_expr_nocond

[bob gailer]

In section 6.12 of the python documentation  (Conditional expressions) 
the term expression_nocond is defined as  or_test | lambda_expr_nocond.

Clicking takes me to lambda_expr_nocond ::=  "lambda" [parameter_list]: 
expression_nocond

Clicking that takes me back to the definition of expression_nocond.

Seems (a) circular and (b) leaves me wondering what lambda_expr_nocond 
and lambda_expr_nocond are.

Any ideas?

Bob Gailer