PSA PAKE: use neutral pronouns

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index 997fec0..02e87ff 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -919,7 +919,7 @@
  *
  * At this point there is a cryptographic guarantee that only the authenticated
  * party who used the same password is able to compute the key. But there is no
- * guarantee that the peer is the party he claims to be and was able to do so.
+ * guarantee that the peer is the party it claims to be and was able to do so.
  *
  * That is, the authentication is only implicit (the peer is not authenticated
  * at this point, and no action should be taken that assume that they are - like
@@ -1604,7 +1604,7 @@
  *
  * At this point there is a cryptographic guarantee that only the authenticated
  * party who used the same password is able to compute the key. But there is no
- * guarantee that the peer is the party he claims to be and was able to do so.
+ * guarantee that the peer is the party it claims to be and was able to do so.
  *
  * That is, the authentication is only implicit (the peer is not authenticated
  * at this point, and no action should be taken that assume that they are - like