Add a comma after `e.g.', so that mdoc does not add two whitespaces automatically.
Add a comma after `e.g.', so that mdoc does not add two whitespaces
automatically.

Noticed by: 	Ruslan Ermilov <ru at FreeBSD.org>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase