Update documentation to reflect list of reserved words

The current list of non-reserved and reserved keywords is on the Hive wiki:

https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Keywords,Non-reservedKeywordsandReservedKeywords

However it does not match the list in code (see the lexer rules here):

https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/HiveLexer.g

On particular example is the "application" keyword, which was discovered while trying to create a table with a column named "application".

This Jira proposes to align the documentation with the current set of non-reserved and reserved keywords.