drm/radeon: fix spelling typos

Found some typos while exploring radeon code.

Signed-off-by: Alexandre Demers <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/radeon/radeon_device.c

···
  * @mc: memory controller structure holding memory informations
  * @base: base address at which to put VRAM
  *
- * Function will place try to place VRAM at base address provided
+ * Function will try to place VRAM at base address provided
  * as parameter (which is so far either PCI aperture address or
  * for IGP TOM base address).
  *
···
  *
  * Note 3: when limiting vram it's safe to overwritte real_vram_size because
  * we are not in case where real_vram_size is inferior to mc_vram_size (ie
- * note afected by bogus hw of Novell bug 204882 + along with lots of ubuntu
+ * not affected by bogus hw of Novell bug 204882 + along with lots of ubuntu
  * ones)
  *
  * Note 4: IGP TOM addr should be the same as the aperture addr, we don't
···
  * @rdev: radeon device structure holding all necessary informations
  * @mc: memory controller structure holding memory informations
  *
- * Function will place try to place GTT before or after VRAM.
+ * Function will try to place GTT before or after VRAM.
  *
  * If GTT size is bigger than space left then we ajust GTT size.
  * Thus function will never fails.

drivers/gpu/drm/radeon/radeon_fence.c

···
 	}
 	radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring);
 	rdev->fence_drv[ring].initialized = true;
-	dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx\n",
+	dev_info(rdev->dev, "fence driver on ring %d uses gpu addr 0x%016llx\n",
 		 ring, rdev->fence_drv[ring].gpu_addr);
 	return 0;
 }

drivers/gpu/drm/radeon/si.c

···
 
 	if (wptr & RB_OVERFLOW) {
 		wptr &= ~RB_OVERFLOW;
-		/* When a ring buffer overflow happen start parsing interrupt
+		/* When a ring buffer overflow happens, start parsing interrupts
 		 * from the last not overwritten vector (wptr + 16). Hopefully
 		 * this should allow us to catchup.
 		 */