[Library] Update dependencies graph and typo about libraries links description

In this commit, I've updated the dependency graph to the Bitcoin 29.0 (The actual maintained version for bitcoin Core). This graph show the entire dependencies links between various library of the code base structure.

Author: heyolaniran

library-structure.adoc

@@ -8,50 +8,59 @@ Bitcoin Core compilation outputs a number of libraries, some which are designed
 The internally-used libraries generally have unstable APIs making them unsuitable for re-use, but `libbitcoin_consensus` and `libbitcoin_kernel` are designed to be re-used by external applications.
 
 Bitcoin Core has a https://github.com/bitcoin/bitcoin/blob/master/doc/design/libraries.md[guide^] which describes the various libraries, their conventions, and their various dependencies.
-The dependency graph is shown below for convenience, but may not be up-to-date with the Bitcoin Core document.
 
-[id=library-dependency-graph]
-.Bitcoin library dependency graph
-[mermaid, target=bitcoin-lib-dependencies]
-....
-flowchart TB
-    bitcoin-wallet --> libbitcoin_wallet_tool
-    bitcoin-wallet --> libbitcoin_wallet
+```mermaid
 
-    bitcoin-qt ---> libbitcoin_wallet
-    bitcoin-qt ---> libbitcoinqt
-    bitcoin-qt ---> libbitcoin_node
+%%{ init : { "flowchart" : { "curve" : "basis" }}}%%
 
-    bitcoind ---> libbitcoin_wallet
-    bitcoind --> libbitcoin_node
+graph TD;
 
-    bitcoin-cli ---> libbitcoin-cli
+bitcoin-cli[bitcoin-cli]-->libbitcoin_cli;
 
-    libbitcoin_wallet_tool --> libbitcoin_wallet
-    libbitcoin_wallet_tool --> libbitcoin_util
+bitcoind[bitcoind]-->libbitcoin_node;
+bitcoind[bitcoind]-->libbitcoin_wallet;
 
-    libbitcoin-cli --> libbitcoin_common
-    libbitcoin-cli --> libbitcoin_util
+bitcoin-qt[bitcoin-qt]-->libbitcoin_node;
+bitcoin-qt[bitcoin-qt]-->libbitcoinqt;
+bitcoin-qt[bitcoin-qt]-->libbitcoin_wallet;
 
-    libbitcoin_node --> libbitcoin_common
-    libbitcoin_node --> libbitcoin_consensus
-    libbitcoin_node --> libbitcoin_kernel
-    libbitcoin_node --> libbitcoin_util
+bitcoin-wallet[bitcoin-wallet]-->libbitcoin_wallet;
+bitcoin-wallet[bitcoin-wallet]-->libbitcoin_wallet_tool;
 
-    libbitcoinqt --> libbitcoin_util
-    libbitcoinqt --> libbitcoin_common
+libbitcoin_cli-->libbitcoin_util;
+libbitcoin_cli-->libbitcoin_common;
 
-    libbitcoin_wallet --> libbitcoin_util
-    libbitcoin_wallet --> libbitcoin_common
+libbitcoin_consensus-->libbitcoin_crypto;
 
-    libbitcoin_common --> libbitcoin_util
-    libbitcoin_common --> libbitcoin_consensus
+libbitcoin_common-->libbitcoin_consensus;
+libbitcoin_common-->libbitcoin_crypto;
+libbitcoin_common-->libbitcoin_util;
 
-    libbitcoin_kernel --> libbitcoin_consensus
-    libbitcoin_kernel --> libbitcoin_util
+libbitcoin_kernel-->libbitcoin_consensus;
+libbitcoin_kernel-->libbitcoin_crypto;
+libbitcoin_kernel-->libbitcoin_util;
 
-    classDef types fill:green,color:white,stroke:green;
-    class bitcoin-wallet,bitcoind,bitcoin-cli,bitcoin-qt types
-....
+libbitcoin_node-->libbitcoin_consensus;
+libbitcoin_node-->libbitcoin_crypto;
+libbitcoin_node-->libbitcoin_kernel;
+libbitcoin_node-->libbitcoin_common;
+libbitcoin_node-->libbitcoin_util;
+
+libbitcoinqt-->libbitcoin_common;
+libbitcoinqt-->libbitcoin_util;
+
+libbitcoin_util-->libbitcoin_crypto;
+
+libbitcoin_wallet-->libbitcoin_common;
+libbitcoin_wallet-->libbitcoin_crypto;
+libbitcoin_wallet-->libbitcoin_util;
+
+libbitcoin_wallet_tool-->libbitcoin_wallet;
+libbitcoin_wallet_tool-->libbitcoin_util;
+
+classDef bold stroke-width:2px, font-weight:bold, font-size: smaller;
+class bitcoin-qt,bitcoind,bitcoin-cli,bitcoin-wallet bold
+```
+**Dependency graph**. Arrows show linker symbol dependencies. `libbitcoin_crypto` depends on nothing. `libbitcoin_util` is depended on by everything. `libbitcoin_kernel` depends only on consensus, crypto, and util.
 
 It follows that API changes to the libraries which are internally-facing can be done slightly easier than for libraries with externally-facing APIs, for which more care for compatibility must be taken.