Clarify swift-t command line

Author: j-woz

workflows/common/sh/README.adoc

@@ -15,7 +15,7 @@ The purpose of these scripts is:
 
 . Set key environment variables and Swift/T options for the system scheduler.  These include +PROCS+, +WALLTIME+, +QUEUE+, +PROJECT+, etc.
 
-. Obtain application parameters and pass to the +swift-t+ command line.  These are currently specified in a special section of the workflow_sh.  These arguments are conventionally stored in a Bash variable +CMD_LINE_ARGS+, and passed to +swift-t+.
+. Obtain application parameters and pass to the +swift-t+ command line.  These are currently specified in a special section of the workflow_sh.  These arguments are conventionally stored in a Bash variable +CMD_LINE_ARGS+, and passed to the +swift-t+ command; they are then available in the Swift script via +argv()+.
 
 . Record what happened.  This involves writing additional logs into the TURBINE_OUTPUT directory, particularly to capture settings and provenance that Swift/T cannot.