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Improve levenshtein() docs.
Fix chars-vs-bytes confusion here too. Improve poor grammar and markup.
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@ -106,15 +106,20 @@ levenshtein_less_equal(text source, text target, int max_d) returns int
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<para>
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Both <literal>source</literal> and <literal>target</literal> can be any
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non-null string, with a maximum of 255 bytes. The cost parameters
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non-null string, with a maximum of 255 characters. The cost parameters
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specify how much to charge for a character insertion, deletion, or
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substitution, respectively. You can omit the cost parameters, as in
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the second version of the function; in that case they all default to 1.
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<literal>levenshtein_less_equal</literal> is accelerated version of
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levenshtein function for low values of distance. If actual distance
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is less or equal then max_d, then <literal>levenshtein_less_equal</literal>
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returns accurate value of it. Otherwise this function returns value
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which is greater than max_d.
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</para>
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<para>
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<function>levenshtein_less_equal</function> is an accelerated version of the
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Levenshtein function for use when only small distances are of interest.
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If the actual distance is less than or equal to <literal>max_d</>,
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then <function>levenshtein_less_equal</function> returns the correct
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distance; otherwise it returns some value greater than <literal>max_d</>.
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If <literal>max_d</> is negative then the behavior is the same as
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<function>levenshtein</function>.
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</para>
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<para>
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