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/savage_drm.h b/include/drm/savage_drm.h
index 4863cf6..818d49b 100644
--- a/include/drm/savage_drm.h
+++ b/include/drm/savage_drm.h
@@ -29,7 +29,7 @@
 #ifndef __SAVAGE_SAREA_DEFINES__
 #define __SAVAGE_SAREA_DEFINES__
 
-/* 2 heaps (1 for card, 1 for agp), each divided into upto 128
+/* 2 heaps (1 for card, 1 for agp), each divided into up to 128
  * regions, subject to a minimum region size of (1<<16) == 64k.
  *
  * Clients may subdivide regions internally, but when sharing between