[doc] Add FILES section to manpage
[doc] Add FILES section to manpage

to mention ~/.ledgerrc more prominently.
[ci skip]

Signed-off-by: Alexis Hildebrandt <f35842cd58123cc4f44e05ddc9691d8604a2519e@surryhill.net>

jwakely/ledger,ledger/ledger,paulbdavis/ledger,jwakely/ledger,duncanmortimer/ledger,afh/ledger,paulbdavis/ledger,jwakely/ledger,paulbdavis/ledger,duncanmortimer/ledger,ledger/ledger,paulbdavis/ledger,paulbdavis/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,afh/ledger,duncanmortimer/ledger,ledger/ledger,jwakely/ledger,afh/ledger,duncanmortimer/ledger,ledger/ledger,duncanmortimer/ledger,afh/ledger,jwakely/ledger,jwakely/ledger,afh/ledger,duncanmortimer/ledger,ledger/ledger,paulbdavis/ledger