[REFACTOR] Hafnium style: capitalize CPU, vCPU, and VM.

Change-Id: I6090deee0f52737653f5b18c09a1c64cadd38c8c
diff --git a/src/vcpu.c b/src/vcpu.c
index a637a5a..2f1b5fc 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -134,7 +134,7 @@
  * Handles a page fault. It does so by determining if it's a legitimate or
  * spurious fault, and recovering from the latter.
  *
- * Returns true if the caller should resume the current vcpu, or false if its VM
+ * Returns true if the caller should resume the current vCPU, or false if its VM
  * should be aborted.
  */
 bool vcpu_handle_page_fault(const struct vcpu *current,