Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e31b220..25c7eb5 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -157,7 +157,7 @@
 };
 
 /*
- * cgroup_event represents events which userspace want to recieve.
+ * cgroup_event represents events which userspace want to receive.
  */
 struct cgroup_event {
 	/*