process(3lua): init man pages

Initialise man pages for the process module.

man/process/process.send.3lua.scd

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+PROCESS.SEND(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*process.send* - send a signal
+
+# SYNOPSIS
+*process.send*(_pid_: *integer*, _sig_: *string*)
+
+# DESCRIPTION
+*process.send* sends the signal named _sig_
+to the process identitied by _pid_.
+
+If an error occurs,
+*process.send* returns nil, an error message and
+a platform-dependent error code.
+There are a few reasons *process.send* can fail;
+see kill(2) for a list of possible error values.
+
+# EXAMPLES
+Send *SIGKILL* to a process with command name *bash*:
+
+	process.send(process.pidof("bash"), "SIGKILL")
+
+# SEE ALSO
+callisto(3lua), process(3lua), kill(2)