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Add comments on some MinimalTupleSlots methods usage

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Original file line number	Diff line number	Diff line change
`@@ -549,6 +549,10 @@ tts_minimal_getsomeattrs(TupleTableSlot *slot, int natts)`
`549`	`549`	`slot_deform_heap_tuple(slot,mslot->tuple,&mslot->off,natts);`
`550`	`550`	`}`
`551`	`551`
	`552`	`+/*`
	`553`	`+ * MinimalTupleTableSlots never provide system attributes. We generally`
	`554`	`+ * shouldn't get here, but provide a user-friendly message if we do.`
	`555`	`+ */`
`552`	`556`	`staticDatum`
`553`	`557`	`tts_minimal_getsysattr(TupleTableSlotslot,intattnum,boolisnull)`
`554`	`558`	`{`
`@@ -561,6 +565,11 @@ tts_minimal_getsysattr(TupleTableSlot slot, int attnum, bool isnull)`
`561`	`565`	`return0;/* silence compiler warnings */`
`562`	`566`	`}`
`563`	`567`
	`568`	`+/*`
	`569`	`+ * Within MinimalTuple abstraction transaction information is unavailable.`
	`570`	`+ * We generally shouldn't get here, but provide a user-friendly message if`
	`571`	`+ * we do.`
	`572`	`+ */`
`564`	`573`	`staticbool`
`565`	`574`	`tts_minimal_is_current_xact_tuple(TupleTableSlot*slot)`
`566`	`575`	`{`

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