Add missing files to files.md

typo

doc/files.md

@@ -1,12 +1,16 @@
-Used in 0.8.0
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-* wallet.dat: personal wallet (BDB) with keys and transactions
-* peers.dat: peer IP address database (custom format); since 0.7.0
+
+* bitcoin.conf: contains configuration settings for bitcoind or bitcoin-qt
+* bitcoind.pid: stores the process id of bitcoind while running
 * blocks/blk000??.dat: block data (custom, 128 MiB per file); since 0.8.0
 * blocks/rev000??.dat; block undo data (custom); since 0.8.0 (format changed since pre-0.8)
 * blocks/index/*; block index (LevelDB); since 0.8.0
 * chainstate/*; block chain state database (LevelDB); since 0.8.0
 * database/*: BDB database environment; only used for wallet since 0.8.0
+* db.log: wallet database log file
+* debug.log: contains debug information and general logging generated by bitcoind or bitcoin-qt
+* fee_estimates.dat: stores statistics used to estimate minimum transaction fees and priorities required for confirmation; since 0.10.0
+* peers.dat: peer IP address database (custom format); since 0.7.0
+* wallet.dat: personal wallet (BDB) with keys and transactions
 
 Only used in pre-0.8.0
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