[patch] document basename() and dirname()

[Ben Collins]

Let me know if this isn't the best section for these definitions, or if
the wording isn't exactly as it should be (WRT to GNU or XPG basename being
prefered).

2001-01-05  Ben Collins  <bcollins@debian.org>

	* manual/string.texi: Finding Tokens in a String: document XPG
	  basename() and dirname(), aswell as GNU basename()

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