message: [addrman] Add doxygen comment to AddrMan::Add()
  Does not document the return value since we're going to fix the
  semantics in a future commit.
diff: @@ -69,7 +69,14 @@ public:
  //! Return the number of (unique) addresses in all tables.
  size_t size() const;
  - //! Add addresses to addrman's new table.
  + /**
  + * Attempt to add one or more addresses to addrman's new table.
  + *
  + * @param[in] vAddr Address records to attempt to add.
  + * @param[in] source The address of the node that sent us these addr records.
  + * @param[in] nTimePenalty A "time penalty" to apply to the address record's nTime. If a peer
  + * sends us an address record with nTime=n, then we'll add it to our
  + * addrman with nTime=(n - nTimePenalty). */
  bool Add(const std::vector<CAddress>& vAddr, const CNetAddr& source, int64_t nTimePenalty = 0);
  //! Mark an entry as accessible, possibly moving it from "new" to "tried".
  