doc: cleanup wallet docs in build-osx.md

Re-order legacy and descriptor wallet section.
Installing sqlite isn't required.
Remove prelude that pointlessly reqpeats the same info.

Author: fanquake

doc/build-osx.md

@@ -68,29 +68,21 @@ git clone https://github.com/bitcoin/bitcoin.git
 #### Wallet Dependencies
 
 It is not necessary to build wallet functionality to run `bitcoind` or  `bitcoin-qt`.
-To enable legacy wallets, you must install `berkeley-db@4`.
-To enable [descriptor wallets](https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md), `sqlite` is required.
-Skip `berkeley-db@4` if you intend to *exclusively* use descriptor wallets.
 
-###### Legacy Wallet Support
+###### Descriptor Wallet Support
 
-`berkeley-db@4` is required to enable support for legacy wallets.
-Skip if you don't intend to use legacy wallets.
+`sqlite` is required to support for descriptor wallets.
 
-``` bash
-brew install berkeley-db@4
-```
+macOS ships with a useable `sqlite` package, meaning you don't need to
+install anything.
 
-###### Descriptor Wallet Support
-
-Note: Apple has included a useable `sqlite` package since macOS 10.14.
-You may not need to install this package.
+###### Legacy Wallet Support
 
-`sqlite` is required to enable support for descriptor wallets.
-Skip if you don't intend to use descriptor wallets.
+`berkeley-db@4` is only required to support for legacy wallets.
+Skip if you don't intend to use legacy wallets.
 
 ``` bash
-brew install sqlite
+brew install berkeley-db@4
 ```
 ---