Merge bitcoin/bitcoin#33827: doc: Correct pkgin command usage on NetBSD

0698c6b494 doc: Correct `pkgin` command usage on NetBSD (Hennadii Stepanov)

Pull request description:

  When using `pkgin` on NetBSD, the `install` command must be specified.

ACKs for top commit:
  fanquake:
    ACK 0698c6b494

Tree-SHA512: 840fc1621d6fa9ad43501a3691a31cffd66c1ac8d34167f7ab0fe33e1a395198c241b3c31f3d0ebc314e28c0edb6055cc2ca3deba6408dcbd14390fd679a4803

doc/build-netbsd.md

@@ -34,7 +34,7 @@ cmake -B build
 SQLite is required for the wallet:
 
 ```bash
-pkgin sqlite3
+pkgin install sqlite3
 ```
 
 To build Bitcoin Core without the wallet, use `-DENABLE_WALLET=OFF`.
@@ -42,7 +42,7 @@ To build Bitcoin Core without the wallet, use `-DENABLE_WALLET=OFF`.
 Cap'n Proto is needed for IPC functionality (see [multiprocess.md](multiprocess.md)):
 
 ```bash
-pkgin capnproto
+pkgin install capnproto
 ```
 
 Compile with `-DENABLE_IPC=OFF` if you do not need IPC functionality.
@@ -84,7 +84,7 @@ Otherwise, if you don't need QR encoding support, use the `-DWITH_QRENCODE=OFF`
 
 Bitcoin Core can provide notifications via ZeroMQ. If the package is installed, support will be compiled in.
 ```bash
-pkgin zeromq
+pkgin install zeromq
 ```
 
 #### Test Suite Dependencies