Some of the comments contains sentences like the following ones.
The fucntion takes on paramater, a boolean flag signifying wether or not the array should include a <none> option.
The 'weight' form atttribute determines the order in which a script is output to the page.
The theming functions can be copied to a theme's template.php, renaming appropriately, so if you theme is called 'mytheme' you would copy function 'theme_theming_example_page()'.
Build a list of supported token types based on the available entites.
I changed the title as I also replaced it's with its when the phrase was using the possessive adjective, and an user / an username with a user / a username.
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Spelling errors in comments need to be fixed.