Claude review: drm/vram: remove DRM_VRAM_MM_FILE_OPERATIONS from docs

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Status: Looks good**

The patch makes three improvements in the kernel-doc comment block:

1. **Prose text update** (line 52 context): Changes `&DRM_VRAM_MM_FILE_OPERATIONS to initialize` to `&DEFINE_DRM_GEM_FOPS to define`. The verb change from "initialize" to "define" is accurate — `DEFINE_DRM_GEM_FOPS` *defines* a `struct file_operations` (it's a declaration macro), whereas the old `DRM_VRAM_MM_FILE_OPERATIONS` was a field-initializer macro used *inside* a struct definition. Also fixes a double-space typo (`and  &DRM_VRAM_MM_FILE_OPERATIONS` → `and &DEFINE_DRM_GEM_FOPS`).

2. **Code example update**: Replaces the manual struct definition:
   ```c
   struct file_operations fops ={
       .owner = THIS_MODULE,
       DRM_VRAM_MM_FILE_OPERATION
   };
   ```
   with the modern one-liner:
   ```c
   DEFINE_DRM_GEM_FOPS(fops);
   ```
   This matches how real drivers use the macro (confirmed by the definition in `include/drm/drm_gem.h:492`).

3. **Bonus fix**: The old code example had a pre-existing typo — `DRM_VRAM_MM_FILE_OPERATION` (missing trailing `S`). This is now moot since the entire block is replaced.

**No issues found.** The commit message is clear, references the originating commit, and the change is minimal and well-scoped.

Reviewed-by tag recommendation: This patch is ready to apply as-is.

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