[doc] Improve quoting in manpage
[doc] Improve quoting in manpage

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