man: Use .In intead of .Fd macros for includes
diff --git a/man/mdX.3bsd b/man/mdX.3bsd
index 38ed0d3..248b90a 100644
--- a/man/mdX.3bsd
+++ b/man/mdX.3bsd
@@ -27,8 +27,8 @@
.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
.Lb libbsd
.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <mdX.h>
+.In sys/types.h
+.In mdX.h
(See
.Xr libbsd 7
for include usage.)
diff --git a/man/readpassphrase.3bsd b/man/readpassphrase.3bsd
index d0237b5..56a2507 100644
--- a/man/readpassphrase.3bsd
+++ b/man/readpassphrase.3bsd
@@ -28,7 +28,7 @@
.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
.Lb libbsd
.Sh SYNOPSIS
-.Fd #include <readpassphrase.h>
+.In readpassphrase.h
(See
.Xr libbsd 7
for include usage.)