Update G.pod
Merge pull request #74 from rns/patch-2

Update G.pod
Improve description of $slg->dsl_form() in POD.
Document that character classes are valid SLIF separators: t+
Eliminating conversion warnings: t+
Eliminating conversion warnings: t+
Eliminating conversion warnings: t+
Eliminating conversion warnings: t+
Eliminating conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+
Eliminating sign conversion warnings: t+