chore: Add definition for name suffix to fluent string

locales-pending/onboarding.ftl

@@ -50,6 +50,8 @@ onboarding-enter-details-label-middle-name = Middle name
 onboarding-enter-details-placeholder-middle-name = Enter middle name
 onboarding-enter-details-label-last-name = Last name
 onboarding-enter-details-placeholder-last-name = Enter last name
+# A name suffix follows a person’s full name and provides additional information
+# about their position, accreditation, etc. Examples: “PhD”, “CCNA”, “OBE”, etc.
 onboarding-enter-details-label-name-suffix = Suffix
 onboarding-enter-details-placeholder-name-suffix = Enter suffix
 onboarding-enter-details-label-location = City and state