Fix some typos

Fix typos and common misspellings in code comments and log messages.

Change-Id: Ie66b89065f2100c1d2125ce5a6c9b1d58df7c8ad
diff --git a/tests/msc_vlr/msc_vlr_test_gsm_ciph.c b/tests/msc_vlr/msc_vlr_test_gsm_ciph.c
index 155afbe..9026241 100644
--- a/tests/msc_vlr/msc_vlr_test_gsm_ciph.c
+++ b/tests/msc_vlr/msc_vlr_test_gsm_ciph.c
@@ -1267,7 +1267,7 @@
 }
 
 /* During CM Service Request or Paging Response we already have Classmark 2 that indicates A5/3
- * availablity. Here, in a hacky way remove the knowledge of Classmark 2 to tickle a code path where
+ * availability. Here, in a hacky way remove the knowledge of Classmark 2 to tickle a code path where
  * proc_arq_fsm needs a Classmark Update during Ciphering. Shouldn't happen in reality though. */
 static void test_cm_service_needs_classmark_update()
 {