doc: Add a manpage for the TctiSocketInit function.

This gives some brief documentation of the function but most importantly
it has an EXAMPLES section with code fragments to demonstrate the use of
the function.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/Makefile.am b/Makefile.am
index 721a8ab..18b5c6c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -66,7 +66,7 @@
 pkgconfigdir          = $(libdir)/pkgconfig
 nodist_pkgconfig_DATA = lib/sapi.pc lib/tcti-device.pc lib/tcti-socket.pc
 # man pages / documentation
-man3_MANS = man/man3/InitDeviceTcti.3
+man3_MANS = man/man3/InitDeviceTcti.3 man/man3/InitSocketTcti.3
 man7_MANS = man/man7/tcti-device.7 man/man7/tcti-socket.7
 
 EXTRA_DIST = \