[docs] [issue22738] improve 'python -h' documentation for '-c'

[Terry J. Reedy]

Terry J. Reedy added the comment:

Semi-useful: print a numeric expression without spaces
C:\Users\Terry>python -c print(2**50)
1125899906842624

Less useful: print a string expression without spaces or double quotes
C:\Users\Terry>python -c print('*'*50)
**************************************************

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22738>
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