Error in Software Serial Documentation - halfBitDelay should be placed before if (low) check [MKC-558]

Issue arduino/Arduino#1315 is not yet solved.
A description of the error can be found here:
https://github.com/arduino/Arduino/issues/1315#issue-11938798

It refers to the Serial Tutorial:
https://www.arduino.cc/en/Tutorial/SoftwareSerial

Read the linked arduino/Arduino#1315 issue for the reported error, then inspect the SoftwareSerial tutorial. Correct the documented placement of halfBitDelay relative to the if (low) check, and verify that the tutorial reflects the intended serial timing behavior.

Written by the indexing model from the issue text.