doWhile.adoc example code is incorrect and will cause "error: ‘x’ undeclared (first use in this function)"

[SeppPenner]

This code

do
{
  delay(50);          // wait for sensors to stabilize
  x = readSensors();  // check the sensors

} while (x < 100);

will never work? The variable is declared inside the loop and thus not even accessable from the while? See http://tpcg.io/50Rx6f to compile this online.

$gcc -o main *.c
main.c: In function ‘main’:
main.c:8:14: error: ‘x’ undeclared (first use in this function)
} while (x < 100);
^
main.c:8:14: note: each undeclared identifier is reported only once for each function it appears in

[SeppPenner]

Solution would be to declare x outside of the loop: https://github.com/arduino/reference-en/pull/456/files:

int x = 0;
do
{
  delay(50);          // wait for sensors to stabilize
  x = readSensors();  // check the sensors

} while (x < 100);

PR is already there @robsoncouto