docs: remove unnecessary notes in Oracle for random sort.

Author: ytetsuro

user_guide_src/source/database/query_builder.rst

@@ -762,9 +762,6 @@ be ignored, unless you specify a numeric seed value.
     $builder->orderBy(42, 'RANDOM');
     // Produces: ORDER BY RAND(42)
 
-.. note:: Random ordering is not currently supported in Oracle and
-    will default to ASC instead.
-
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 Limiting or Counting Results
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