[m-rev.] Trivial diff: fix a typo in the tutorial

[Ralph Becket]

Estimated hours taken: 0.1

w3/tutorial/book/book.ps:
w3/tutorial/book/book.ps.gz:
w3/tutorial/book/book.pdf:
	Updated to correct a typo spotted by Ryan Kelly (the text previously
	stated that disjuncts are separated by commas rather than semicolons).

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