[manual] old remnants in doc page?

[Francesco Potorti`]

In The unwind_protect Statement:

|   This is useful to protect temporary changes to global variables from
|possible errors.  For example, the following code will always restore
|the original value of the global variable `frobnositcate' even if an
|error occurs while performing the indexing operation.

But the example code contains no indexing operation, only "...".

|Without `unwind_protect', the value of FROBNOSTICATE would not be
|restored if an error occurs while performing the indexing operation

same as above