[doc] conf: Remove deprecated options from docs, Other cleanup

* conf: Remove deprecated options from docs
* Remove only mention of MIT/X11
* Link to developer notes in README.md

share/examples/bitcoin.conf

@@ -71,12 +71,9 @@
 # is .cookie and found in the `-datadir` being used for bitcoind. This option is typically used
 # when the server and client are run as the same user.
 #
-# If not, you must set rpcuser and rpcpassword to secure the JSON-RPC api. The first
-# method(DEPRECATED) is to set this pair for the server and client:
-#rpcuser=Ulysseys
-#rpcpassword=YourSuperGreatPasswordNumber_DO_NOT_USE_THIS_OR_YOU_WILL_GET_ROBBED_385593
+# If not, you must set rpcuser and rpcpassword to secure the JSON-RPC API.
 #
-# The second method `rpcauth` can be added to server startup argument. It is set at initialization time
+# The config option `rpcauth` can be added to server startup argument. It is set at initialization time
 # using the output from the script in share/rpcauth/rpcauth.py after providing a username:
 #
 # ./share/rpcauth/rpcauth.py alice
@@ -116,21 +113,21 @@
 # running on another host using this option:
 #rpcconnect=127.0.0.1
 
+# Wallet options
+
 # Create transactions that have enough fees so they are likely to begin confirmation within n blocks (default: 6).
 # This setting is over-ridden by the -paytxfee option.
 #txconfirmtarget=n
 
+# Pay a transaction fee every time you send bitcoins.
+#paytxfee=0.000x
+
 # Miscellaneous options
 
 # Pre-generate this many public/private key pairs, so wallet backups will be valid for
 # both prior transactions and several dozen future transactions.
 #keypool=100
 
-# Pay an optional transaction fee every time you send bitcoins.  Transactions with fees
-# are more likely than free transactions to be included in generated blocks, so may
-# be validated sooner.
-#paytxfee=0.00
-
 # Enable pruning to reduce storage requirements by deleting old blocks. 
 # This mode is incompatible with -txindex and -rescan.
 # 0 = default (no pruning).