drm/i915/display: Fix htmldocs build

drm/i915/display: Fix htmldocs build

Fixes a wrong documentation block indentation:

Documentation/gpu/i915:141: ./drivers/gpu/drm/i915/display/intel_hotplug.c:1080: ERROR: Unexpected indentation.
Documentation/gpu/i915:141: ./drivers/gpu/drm/i915/display/intel_hotplug.c:1082: WARNING: Block quote ends without a blank line; unexpected unindent.

v2: Use an empty line instead of changing block indentation (Imre)

Fixes: 0d77a3e0ea90 ("drm/i915/hpd: Add support for blocking the IRQ handling on an HPD pin")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/intel-gfx/20250312232506.47451f83@canb.auug.org.au/
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250328180829.25892-1-rodrigo.vivi@intel.com
Link: https://lore.kernel.org/r/20250328193202.40884-1-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>