Readded docs for some arguments to global functions.

Those were overzealously removed in 28623fc538.

src/libstrongswan/credentials/keys/private_key.h

@@ -133,10 +133,11 @@ struct private_key_t {
 /**
  * Generic private key equals() implementation, usable by implementors.
  *
+ * @param private		private key to check
  * @param other			key to compare
  * @return				TRUE if this is equal to other
  */
-bool private_key_equals(private_key_t *this, private_key_t *other);
+bool private_key_equals(private_key_t *private, private_key_t *other);
 
 /**
  * Generic private key belongs_to() implementation, usable by implementors.
@@ -150,9 +151,10 @@ bool private_key_belongs_to(private_key_t *private, public_key_t *public);
 /**
  * Generic private key has_fingerprint() implementation, usable by implementors.
  *
+ * @param private		private key to check
  * @param fingerprint	fingerprint to check
  * @return				TRUE if key has given fingerprint
  */
-bool private_key_has_fingerprint(private_key_t *this, chunk_t fingerprint);
+bool private_key_has_fingerprint(private_key_t *private, chunk_t fingerprint);
 
 #endif /** PRIVATE_KEY_H_ @}*/