[unreachable.sentinel] Incorrect usage example of std::unreachable_sentinel

An incorrect description of an example was spotted on Stack Overflow (the comment under the question), [unreachable.sentinel] p2 says:

[Example 1 :

char* p;
// set p to point to a character buffer containing newlines
char* nl = find(p, unreachable_sentinel, '\n');

Provided a newline character really exists in the buffer, the use of unreachable_sentinel above potentially makes
the call to find more efficient since the loop test against the sentinel does not require a conditional branch. — end
example]

The description says that the example is well-defined if a null character is reachable from p, but std::ranges::find requires the input range to be valid, as [iterator.requirements.general] p12 says:

The result of the application of library functions to invalid ranges is undefined.

Read the [unreachable.sentinel] p2 example alongside [iterator.requirements.general] p12, which the issue cites. Confirm how the example's range validity requirement affects its description, then update the standard draft wording so the example does not claim validity under an insufficient condition.