drm/nouveau/mmu: drop unexpected word "the" in the comments

there is an unexpected word "the" in the comments that need to be dropped

file: drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
line: 1051
 * have the the deepest nesting of page tables.
changed to
 * have the deepest nesting of page tables.

Signed-off-by: Jiang Jian <jiangjian@cdjrlc.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220621133920.8112-1-jiangjian@cdjrlc.com