fix various issues

- Improve some function names
- Improve comments
- improve readability

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/aesce.h b/library/aesce.h
index 741519c..0d6d09e 100644
--- a/library/aesce.h
+++ b/library/aesce.h
@@ -2,7 +2,7 @@
  * \file aesce.h
  *
  * \brief AES-CE for hardware AES acceleration on ARMv8 processors with crypto
- *        engine.
+ *        extension.
  *
  * \warning These functions are only for internal use by other library
  *          functions; you must not call them directly.
@@ -43,7 +43,7 @@
 #endif
 
 /**
- * \brief          Internal function to detect the crypto engine in CPUs.
+ * \brief          Internal function to detect the crypto extension in CPUs.
  *
  * \return         1 if CPU has support for the feature, 0 otherwise
  */