Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 8ec6b06..23719f0 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -454,7 +454,7 @@
  * @rtc: pointer to the rtc device
  *
  * This function is called when an AIE, UIE or PIE mode interrupt
- * has occured (or been emulated).
+ * has occurred (or been emulated).
  *
  * Triggers the registered irq_task function callback.
  */