Updating .script, .upgrade and .exit commands help text

[jharajeev55]

No description provided.

[github-actions]

Package	Line Rate	Health
kic-discover-visa/src/ethernet/mod.rs	0%	❌
kic-discover/src/lib.rs	0%	❌
kic/src/main.rs	0%	❌
kic-discover/src/instrument_discovery/mod.rs	0%	❌
kic-discover-visa/src/main.rs	0%	❌
kic-visa/src/process.rs	0%	❌
instrument-repl/src/resources/mod.rs	100%	✔
kic-discover-visa/src/instrument_discovery/mod.rs	0%	❌
instrument-repl/src/instrument.rs	86%	✔
kic-discover/src/usbtmc/mod.rs	0%	❌
kic-discover/src/ethernet/mod.rs	0%	❌
instrument-repl/src/state_machine.rs	63%	✔
kic-discover-visa/src/lib.rs	0%	❌
kic-discover-visa/src/usbtmc/mod.rs	0%	❌
kic/src/process.rs	0%	❌
instrument-repl/src/tsp_error.rs	0%	❌
kic-visa/src/main.rs	0%	❌
kic-discover/src/main.rs	0%	❌
kic-discover-visa/src/visa.rs	0%	❌
instrument-repl/src/repl.rs	0%	❌
kic-discover/src/process.rs	0%	❌
Summary	10% (295 / 2840)	❌