Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 685a67d..6302747 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -46,7 +46,7 @@
 }
 
 /*
- * trace_clock(): 'inbetween' trace clock. Not completely serialized,
+ * trace_clock(): 'between' trace clock. Not completely serialized,
  * but not completely incorrect when crossing CPUs either.
  *
  * This is based on cpu_clock(), which will allow at most ~1 jiffy of