[SPARK-36738][SQL][DOC] Fixed the wrong documentation on Cot API
### What changes were proposed in this pull request?
Fixed wrong documentation on Cot API
### Why are the changes needed?
[Doc](https://spark.apache.org/docs/latest/api/sql/index.html#cot) says `1/java.lang.Math.cot` but it should be `1/java.lang.Math.tan`.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Manual check.
Closes #33978 from yutoacts/SPARK-36738.
Authored-by: Yuto Akutsu <yuto.akutsu@nttdata.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
(cherry picked from commit 3747cfdb40
)
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
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@ -731,7 +731,7 @@ case class Tan(child: Expression) extends UnaryMathExpression(math.tan, "TAN") {
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@ExpressionDescription(
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usage = """
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_FUNC_(expr) - Returns the cotangent of `expr`, as if computed by `1/java.lang.Math._FUNC_`.
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_FUNC_(expr) - Returns the cotangent of `expr`, as if computed by `1/java.lang.Math.tan`.
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""",
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arguments = """
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Arguments:
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