Fix typos.

Change-Id: I3955318b4a0fd6fa6e10dbcfd20f2d675075d467
diff --git a/src/api.c b/src/api.c
index b43c24fc..1cba24f 100644
--- a/src/api.c
+++ b/src/api.c
@@ -542,7 +542,7 @@
 }
 
 /**
- * Return wheher the current vCPU is allowed to inject an interrupt into the
+ * Returns whether the current vCPU is allowed to inject an interrupt into the
  * given VM and vCPU.
  */
 static inline bool is_injection_allowed(uint32_t target_vm_id,