Typos in XSD and XML files

TrainClearanceGauges.xml "stucture" -> "structure" ("description" field is a natural language string therefore does not brake backward compatibility)

TrainProtectionSystems.xsd "an railML file" -> "a railML file"

InfrastructureManagers.xsd, TrainClearanceGauges.xsd, TrainProtectionSystems.xsd "latin" -> "Latin"

changed the description

assigned to @coordination.CO

mentioned in commit e3abfde0

closed