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MINOR: [Docs][Format] Add link to IPC section on the Columnar page (#33788)

### Rationale for this change

Linking directly to the IPC section makes it easier to find what people are looking for.

### What changes are included in this PR?

Adds a link to the section about IPC (on the columnar page) from the IPC page.

Authored-by: Matthijs Brobbel <m1brobbel@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>