Just noticed this in passing while working on something else.
Index: lib/libtls/man/tls_conn_version.3
===================================================================
RCS file: /cvs/src/lib/libtls/man/tls_conn_version.3,v
retrieving revision 1.7
diff -u -p -r1.7 tls_conn_version.3
--- lib/libtls/man/tls_conn_version.3 10 Feb 2018 04:43:16 -0000 1.7
+++ lib/libtls/man/tls_conn_version.3 26 May 2018 10:52:07 -0000
@@ -54,8 +54,8 @@
.Fc
.Ft const uint8_t *
.Fo tls_peer_cert_chain_pem
-.Fa struct tls *ctx
-.Fa size_t *size
+.Fa "struct tls *ctx"
+.Fa "size_t *size"
.Fc
.Ft const char *
.Fn tls_peer_cert_issuer "struct tls *ctx"
