Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index efed082..8b52c9a 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -223,9 +223,9 @@
 	 * @mem::mm_node should be set to a non-null value, and
 	 * @mem::start should be set to a value identifying the beginning
 	 * of the range allocated, and the function should return zero.
-	 * If the memory region accomodate the buffer object, @mem::mm_node
+	 * If the memory region accommodate the buffer object, @mem::mm_node
 	 * should be set to NULL, and the function should return 0.
-	 * If a system error occured, preventing the request to be fulfilled,
+	 * If a system error occurred, preventing the request to be fulfilled,
 	 * the function should return a negative error code.
 	 *
 	 * Note that @mem::mm_node will only be dereferenced by
@@ -841,7 +841,7 @@
  * different order, either by will or as a result of a buffer being evicted
  * to make room for a buffer already reserved. (Buffers are reserved before
  * they are evicted). The following algorithm prevents such deadlocks from
- * occuring:
+ * occurring:
  * 1) Buffers are reserved with the lru spinlock held. Upon successful
  * reservation they are removed from the lru list. This stops a reserved buffer
  * from being evicted. However the lru spinlock is released between the time