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Although the asciidoc toolchain accepts any number of ~ to delimit a listing block (i.e. a code block), it is actually specified to be exactly four, i.e. ~~~~. Currently, a mix of diffrent numbers of ~ are being used - sometimes even a different number at the beginning and at the end of the block. Normalize this to always use exactly four ~ for the delimiter. Signed-off-by: Arnout Vandecappelle <arnout@mind.be>