doc: drop the --production flag for installing windows-build-tools

This isn't needed, and was probably copy-pasted from
windows-build-tools' README.md, which has since been changed
to drop the `--production` flag from the install instructions.

PR-URL: #34979
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

doc/api/n-api.md

@@ -147,7 +147,7 @@ tools. However, it is not necessary to install the entire Visual Studio
 IDE. The following command installs the necessary toolchain:
 
 ```bash
-npm install --global --production windows-build-tools
+npm install --global windows-build-tools
 ```
 
 The sections below describe the additional tools available for developing