Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 04ef830..8859a41 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1291,7 +1291,7 @@
 			return true;
 		spin_unlock_irq(&gcwq->lock);
 
-		/* CPU has come up inbetween, retry migration */
+		/* CPU has come up in between, retry migration */
 		cpu_relax();
 	}
 }