Clean-up config setter/getter doc comments

[2010YOUY01]

Is your feature request related to a problem or challenge?

A configuration option's main documentation should live in the comment on the config definition, since the docs are auto-generated from there: https://datafusion.apache.org/user-guide/configs.html

The setters and getters for a configuration option should simply point to the config field, so the documentation stays centralized.

datafusion/datafusion/execution/src/config.rs

Lines 197 to 207 in 35c56b0

	/// Customize [`target_partitions`]
	///
	/// [`target_partitions`]: datafusion_common::config::ExecutionOptions::target_partitions
	pub fn with_target_partitions(mut self, n: usize) -> Self {
	self.options_mut().execution.target_partitions = if n == 0 {
	datafusion_common::config::ExecutionOptions::default().target_partitions
	} else {
	n
	};
	self
	}

However, some config options try to explain it again in the setter/getter:

datafusion/datafusion/execution/src/config.rs

Line 301 in 35c56b0

pub fn with_repartition_aggregations(mut self, enabled: bool) -> Self {

It would be better to keep the setter/getter comments consistent: simply point to the definition.

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