drm/xe: Documentation: fix chars used for subsection

Fixes "ERROR: A level 2 section cannot be used here".
Equal signs are reserved for document titles.
This file docs gets imported by driver-uapi.rst,
and the page title is defined there.

Signed-off-by: Rafael Passos <rafael@rcpassos.me>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260701012141.167868-1-rafael@rcpassos.me
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
[Rodrigo modified the subject while pushing it]
This commit is contained in:
Rafael Passos 2026-06-30 22:20:58 -03:00 • committed by Rodrigo Vivi
commit 3a8bfa1f2a
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