[Hadoop Wiki] Update of "Hive/LanguageManual/UDF" by MayankLahiri

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The "Hive/LanguageManual/UDF" page has been changed by MayankLahiri.
The comment on this change is: added ngrams() and context_ngrams() to UDAF list..
http://wiki.apache.org/hadoop/Hive/LanguageManual/UDF?action=diff&rev1=49&rev2=50

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  ||list ||split(string str, string pat) ||Split str around pat (pat is a regular expression) ||
  ||int ||find_in_set(string str, string strList) ||Returns the first occurance of str in strList where strList is a comma-delimited string. Returns null if either argument is null. Returns 0 if the first argument contains any commas. e.g. find_in_set('ab', 'abc,b,ab,c,def') returns 3 ||
  ||array<array<string>> || sentences(string str, string lang, string locale) || Tokenizes a string of natural language text into words and sentences, where each sentence is broken at the appropriate sentence boundary and returned as an array of words. The 'lang' and 'locale' are optional arguments. e.g. sentences('Hello there! How are you?') returns ( ("Hello", "there"), ("How", "are", "you") ) ||
+ ||array<struct<string,double>> || ngrams(array<array<string>>, int N, int K, int pf) || Returns the top-k N-grams from a set of tokenized sentences, such as those returned by the sentences() UDAF. See [[Hive/StatisticsAndDataMining]] for more information. ||
+ ||array<struct<string,double>> || context_ngrams(array<array<string>>, array<string>, int K, int pf) || Returns the top-k contextual N-grams from a set of tokenized sentences, given a string of "context". See [[Hive/StatisticsAndDataMining]] for more information.||