Fixed typo in docs of spam function in intro.py

The documentation of the spam function ponts that if the a user called "Vimal" uses the function, this will raise an Exception, but in the program the string that is specified is "Vimol", the same occurs in the Readme.md file
Merge pull request #2 from ivancho1707/patch-2

Fixed typo in docs of spam function in intro.py