Possibly wrong standard naming in section about "ANSI-join"

Section "Try to use ANSI-join syntax”.

The text suggests that the bad example is not ANSI. As far as I know it is ANSI, ANSI-89 to be precise. The good example is ANSI-92.

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I refer to the [pdf, commit cf4d9b0](https://github.com/Trivadis/plsql-and-sql-coding-guidelines/blob/develop/PLSQL-and-SQL-Coding-Guidelines.pdf); however, I guess it's true for the doc as well.