Fix spelling error in fuzzystrmatch docs.

doc/src/sgml/fuzzystrmatch.sgml

@@ -95,7 +95,7 @@ levenshtein_less_equal(text source, text target, int max_d) returns int
    substitution, respectively.  You can omit the cost parameters, as in
    the second version of the function; in that case they all default to 1.
    <literal>levenshtein_less_equal</literal> is accelerated version of
-   levenshtein functon for low values of distance. If actual distance
+   levenshtein function for low values of distance. If actual distance
    is less or equal then max_d, then <literal>levenshtein_less_equal</literal>
    returns accurate value of it. Otherwise this function returns value
    which is greater than max_d.