Fix duplicate C declaration warnings

Fix duplicate C declaration warnings at
Documentation/gpu/drm-kms.rst that was found by
compiling htmldocs

/home/amogh/Linux_Kernel_Workspace/linux-next/Documentation/gpu/drm- kms:360: ./drivers/gpu/drm/drm_fourcc.c:344: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:39.
Declaration is '.. c:function:: const struct drm_format_info * drm_format_info (u32 format)'. /home/amogh/Linux_Kernel_Workspace/linux-next/Documentation/gpu/drm- kms:461: ./drivers/gpu/drm/drm_modeset_lock.c:392: WARNING: Duplicate C declaration, also defined at gpu/drm-kms:49.
Declaration is '.. c:function:: int drm_modeset_lock (struct drm_modeset_lock *lock, struct drm_modeset_acquire_ctx *ctx)'.

---

changes in v2
- add warnings found after compilation
- fix grammar in commit description

---
 Documentation/gpu/drm-kms.rst | 6 ------
 1 file changed, 6 deletions(-)

index 13d3627d8bc0..a4145f391e43 100644
@@ -357,9 +357,6 @@ Format Functions Reference
 .. kernel-doc:: include/drm/drm_fourcc.h
    :internal:
 
-.. kernel-doc:: drivers/gpu/drm/drm_fourcc.c
-   :export:
-
 .. _kms_dumb_buffer_objects:
 
 Dumb Buffer Objects

@@ -458,9 +455,6 @@ KMS Locking
 .. kernel-doc:: include/drm/drm_modeset_lock.h
    :internal:
 
-.. kernel-doc:: drivers/gpu/drm/drm_modeset_lock.c
-   :export:
-
 KMS Properties
 ==============
 

2.44.0