[PATCH v2] htmldocs: userspace-api/dma-buf-heaps.rst: fix block quote warning

[Kriish Sharma]

Fix the following warning encountered when running `make htmldocs`:

  Documentation/userspace-api/dma-buf-heaps.rst:29: WARNING: Block quote ends without a blank line; unexpected unindent

Added a blank line before the "Naming Convention" heading to comply with reST

Fixes: 507211e3c7a1 ("Documentation: dma-buf: heaps: Add naming guidelines")
Reviewed-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Tested-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Kriish Sharma <kriish.sharma2006@xxxxxxxxx>
---
v2:
 - Corrected the Fixes tag per Bagas Sanjaya’s review.

v1: https://lore.kernel.org/all/20251015183402.1649988-1-kriish.sharma2006@xxxxxxxxx/
 
 Documentation/userspace-api/dma-buf-heaps.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst
index a0979440d2a4..c0035dc257e0 100644
--- a/Documentation/userspace-api/dma-buf-heaps.rst
+++ b/Documentation/userspace-api/dma-buf-heaps.rst
@@ -26,6 +26,7 @@ following heaps:
    ``DMABUF_HEAPS_CMA_LEGACY`` Kconfig option is set, a duplicate node is
    created following legacy naming conventions; the legacy name might be
    ``reserved``, ``linux,cma``, or ``default-pool``.
+
 Naming Convention
 =================
 
-- 
2.34.1