Merge bitcoin/bitcoin#30154: doc: update mention of generating bitcoin.conf

9013e2b Link to gen-bitcoin-conf.sh instead of bitcoin.conf placeholder (Epic Curious)

Pull request description:

  Closes #30153.

  This PR updates `doc/init.md` to mention generating an example bitcoin.conf instead of referencing the placeholder `share/examples/bitcoin.conf`. Also changes the code-formatted text to a markdown link.

  ## Background

  - Two years ago, `share/examples/bitcoin.conf` was replaced with [a placeholder file](bitcoin/bitcoin@b483084). To see an example `bitcoin.conf`, the user now runs the `contrib/devtools/gen-bitcoin-conf.sh` script, which replaces the placeholder file with the parsed contents of `bitcoind --help`.

  - The instructions in `init.md` about an example `bitcoin.conf` haven't changed significantly since they were [added almost 10 years ago](https://github.com/bitcoin/bitcoin/blame/234bfbf6a5fcba37e510e9cb6c1f2a629cd0290e/doc/init.md#L39). They should be updated to improve clarity.

ACKs for top commit:
  edilmedeiros:
    ACK 9013e2b
  kevkevinpal:
    reACK [9013e2b](bitcoin/bitcoin@9013e2b)
  achow101:
    ACK 9013e2b
  stickies-v:
    ACK 9013e2b
  tdb3:
    ACK for 9013e2b

Tree-SHA512: 5ac5ad672ad181d574e19e29c3727fb9e5373282444fae09b42d113d5c8915cb2829d496212638cdc4b70540b7e1794a751fcdc9539f956a594cddd70c8fd747

Author: achow101

doc/init.md

@@ -43,8 +43,8 @@ This allows for running bitcoind without having to do any manual configuration.
 `conf`, `pid`, and `wallet` accept relative paths which are interpreted as
 relative to the data directory. `wallet` *only* supports relative paths.
 
-For an example configuration file that describes the configuration settings,
-see `share/examples/bitcoin.conf`.
+To generate an example configuration file that describes the configuration settings,
+see [contrib/devtools/README.md](../contrib/devtools/README.md#gen-bitcoin-confsh).
 
 Paths
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