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add more info on init_callbacks to README.md

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Original file line number	Diff line number	Diff line change
`@@ -209,7 +209,24 @@ Enable/disable auto partition propagation (only for RANGE partitioning). It is e`
`209`	`209`	```plpgsql
`210`	`210`	`set_init_callback(relation REGCLASS, callback REGPROC DEFAULT0)`
`211`	`211`	```
`212`		`-Set partition creation callback to be invoked for each attached or created partition (both HASH and RANGE).`
	`212`	+Set partition creation callback to be invoked for each attached or created partition (both HASH and RANGE). The callback must have the following signature:`part_init_callback(args JSONB) RETURNS VOID`. Parameter`arg` consists of several fields whose presence depends on partitioning type:
	`213`	+```json
	`214`	`+/* RANGE-partitioned table abc (child abc_4) */`
	`215`	`+{`
	`216`	`+"parent":"abc",`
	`217`	`+"parttype":"2",`
	`218`	`+"partition":"abc_4",`
	`219`	`+"range_max":"401",`
	`220`	`+"range_min":"301"`
	`221`	`+}`
	`222`	`+`
	`223`	`+/* HASH-partitioned table abc (child abc_0) */`
	`224`	`+{`
	`225`	`+"parent":"abc",`
	`226`	`+"parttype":"1",`
	`227`	`+"partition":"abc_0"`
	`228`	`+}`
	`229`	+```
`213`	`230`
`214`	`231`	`##Views and tables`
`215`	`232`

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