man: Add man page sections to function references

Signed-off-by: Guillem Jover <guillem@hadrons.org>

man/libbsd.7

@@ -76,7 +76,7 @@ The package also provides a
 .Pa bsd-ctor
 static library that can be used to inject automatic constructors into a
 program so that the
-.Fn setproctitle_init
+.Fn setproctitle_init 3
 function gets invoked automatically at startup time.
 This can be done with the
 .Xr pkg-config 3
@@ -134,7 +134,7 @@ or non-buggy way; or because there are better more portable replacements now.
 .Pp
 This is the list of currently deprecated macros and functions:
 .Bl -tag -width 4m
-.It Fn fgetln
+.It Fn fgetln 3
 Unportable, requires assistance from the stdio layer.
 An implementation has to choose between leaking buffers or being reentrant
 for a limited amount of streams (this implementation chose the latter with
@@ -143,7 +143,7 @@ Use
 .Fn getline 3
 instead, which is available in many systems and required by
 .St -p1003.1-2008 .
-.It Fn fgetwln
+.It Fn fgetwln 3
 Unportable, requires assistance from the stdio layer.
 An implementation has to choose between leaking buffers or being reentrant
 for a limited amount of streams (this implementation chose the latter with
@@ -154,10 +154,10 @@ instead, which is available in many systems and required by
 .St -isoC-99
 and
 .St -p1003.1-2001 .
-.It Fn funopen
+.It Fn funopen 3
 Unportable, requires assistance from the stdio layer or some hook framework.
 On GNU systems the
-.Fn fopencookie
+.Fn fopencookie 3
 function can be used.
 Otherwise the code needs to be prepared for neither of these functions being
 available.
@@ -171,23 +171,23 @@ are present in all major
 for example.
 .Pp
 .Bl -tag -width 4m -compact
-.It Fn MD5Init
-.It Fn MD5Update
-.It Fn MD5Pad
-.It Fn MD5Final
-.It Fn MD5Transform
-.It Fn MD5End
-.It Fn MD5File
-.It Fn MD5FileChunk
-.It Fn MD5Data
+.It Fn MD5Init 3
+.It Fn MD5Update 3
+.It Fn MD5Pad 3
+.It Fn MD5Final 3
+.It Fn MD5Transform 3
+.It Fn MD5End 3
+.It Fn MD5File 3
+.It Fn MD5FileChunk 3
+.It Fn MD5Data 3
 The set of MD5 digest functions are now provided by the
 .Nm libmd
 companion library, so it is advised to use that instead.
-.It Fn explicit_bzero
+.It Fn explicit_bzero 3
 This function is provided by
 .Nm glibc
 2.25.
-.It Fn reallocarray
+.It Fn reallocarray 3
 This function is provided by
 .Nm glibc
 2.26.