Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/sparc/kernel/init_task.c b/arch/sparc/kernel/init_task.c
index 5fe3d65..35f141a 100644
--- a/arch/sparc/kernel/init_task.c
+++ b/arch/sparc/kernel/init_task.c
@@ -15,7 +15,7 @@
 
 /* .text section in head.S is aligned at 8k boundary and this gets linked
  * right after that so that the init_thread_union is aligned properly as well.
- * If this is not aligned on a 8k boundry, then you should change code
+ * If this is not aligned on a 8k boundary, then you should change code
  * in etrap.S which assumes it.
  */
 union thread_union init_thread_union __init_task_data =