The output you posted for help doc doesn't match the help text I see when I run that command. Did you post exactly what you see or did you paraphrase?
In release R2019a, what is the last line of your help.m file? In my installation it is a blank line, line 67. The copyright line (line 41) states 1984-2019. Can you confirm that you see the same?
In my installation, doc.m has 209 lines with line 209 being a blank line. The last function in doc.m is displayFile. The copyright line (line 45) reads 1984-2013. Can you confirm that you see the same?
I'm wondering if you accidentally copied versions of help.m file (and maybe doc.m) from an older release of MATLAB.