Apply suggestions from GIT Copilot code review

Good catches on names and strings.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: PetrilloAtWork

icaruscode/PMT/Trigger/LVDSgates_module.cc

@@ -879,7 +879,7 @@ art::InputTag icarus::trigger::LVDSgates::makeTag
     ? art::InputTag{ thresholdStr }
     : defModule.label().empty()
       ? throw (art::Exception(art::errors::Configuration)
-        << "Default module label (`TriggerGatesTag`) specified"
+        << "No default module label (`TriggerGatesTag`) specified"
            ", and it's needed for threshold '" << thresholdStr << "'.\n")
       : art::InputTag{ defModule.label(), thresholdStr, defModule.process() }
     ;

icaruscode/PMT/Trigger/MajorityTriggerSimulation_module.cc

@@ -361,7 +361,7 @@ class icarus::trigger::MajorityTriggerSimulation
 
     fhicl::Atom<art::InputTag> TriggerGatesTag {
       Name("TriggerGatesTag"),
-      Comment("label of the input trigger gate data product (no instance name)")
+      Comment("tag of the input trigger gate data product")
       };
 
     fhicl::Sequence<raw::ADC_Count_t> Thresholds {