Fix error message when parsing qualified names

The error message returned when the last character of vendor, class,
or device names did not match the criteria checked. This change
updates the error message.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

Author: elezar

pkg/cdi/qualified-device.go

@@ -130,7 +130,7 @@ func ValidateVendorName(vendor string) error {
 		}
 	}
 	if !isAlphaNumeric(rune(vendor[len(vendor)-1])) {
-		return errors.Errorf("invalid vendor %q, should end with letter", vendor)
+		return errors.Errorf("invalid vendor %q, should end with a letter or digit", vendor)
 	}
 
 	return nil
@@ -158,7 +158,7 @@ func ValidateClassName(class string) error {
 		}
 	}
 	if !isAlphaNumeric(rune(class[len(class)-1])) {
-		return errors.Errorf("invalid class %q, should end with letter", class)
+		return errors.Errorf("invalid class %q, should end with a letter or digit", class)
 	}
 	return nil
 }
@@ -188,7 +188,7 @@ func ValidateDeviceName(name string) error {
 		}
 	}
 	if !isAlphaNumeric(rune(name[len(name)-1])) {
-		return errors.Errorf("invalid name %q, should start with letter", name)
+		return errors.Errorf("invalid name %q, should end with a letter or digit", name)
 	}
 	return nil
 }