doc: Clarify take kernel semantics (#6632)

* doc: Clarify take kernel behavior

* fix

* Update arrow-select/src/take.rs

Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

---------

Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

arrow-select/src/take.rs

@@ -50,6 +50,10 @@ use num::{One, Zero};
 ///
 /// For selecting values by index from multiple arrays see [`crate::interleave`]
 ///
+/// Note that this kernel, similar to other kernels in this crate,
+/// will avoid allocating where not necessary. Consequently
+/// the returned array may share buffers with the inputs
+///
 /// # Errors
 /// This function errors whenever:
 /// * An index cannot be casted to `usize` (typically 32 bit architectures)