drm/gpuvm: doc: fix filename references

Commit f72c2db ("drm/gpuvm: rename struct drm_gpuva_manager to
struct drm_gpuvm") did also change the corresponding filenames which are
referenced from the documentation, but were not adjusted accordingly.
Hence, fix up those filenames.

Fixes: f72c2db ("drm/gpuvm: rename struct drm_gpuva_manager to struct drm_gpuvm")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/dri-devel/20230926150725.4cca5fc5@canb.auug.org.au/
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230926105146.10808-1-dakr@redhat.com

Documentation/gpu/drm-mm.rst

@@ -466,40 +466,40 @@ DRM MM Range Allocator Function References
 .. kernel-doc:: drivers/gpu/drm/drm_mm.c
    :export:
 
-DRM GPU VA Manager
-==================
+DRM GPUVM
+=========
 
 Overview
 --------
 
-.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+.. kernel-doc:: drivers/gpu/drm/drm_gpuvm.c
    :doc: Overview
 
 Split and Merge
 ---------------
 
-.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+.. kernel-doc:: drivers/gpu/drm/drm_gpuvm.c
    :doc: Split and Merge
 
 Locking
 -------
 
-.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+.. kernel-doc:: drivers/gpu/drm/drm_gpuvm.c
    :doc: Locking
 
 Examples
 --------
 
-.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+.. kernel-doc:: drivers/gpu/drm/drm_gpuvm.c
    :doc: Examples
 
-DRM GPU VA Manager Function References
---------------------------------------
+DRM GPUVM Function References
+-----------------------------
 
-.. kernel-doc:: include/drm/drm_gpuva_mgr.h
+.. kernel-doc:: include/drm/drm_gpuvm.h
    :internal:
 
-.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
+.. kernel-doc:: drivers/gpu/drm/drm_gpuvm.c
    :export:
 
 DRM Buddy Allocator