some package:parsers

One or more.
Usually, someSpace consists of one or more occurrences of a space. Some parsers may choose to recognize line comments or block (multi line) comments as white space as well.
skipSome p applies the parser p one or more times, skipping its result. (aka skipMany1 in parsec)
Use this to easily build the definition of whiteSpace for your MonadParser given a comment style and an underlying someWhiteSpace parser