docs: fix error in toolchain setup (#17154)

Signed-off-by: Alexandre Gaudreault <[email protected]>

docs/developer-guide/toolchain-guide.md

@@ -304,7 +304,7 @@ For installing the tools required to build and test Argo CD on your local system
 You can change the target location by setting the `BIN` environment before running the installer scripts. For example, you can install the binaries into `~/go/bin` (which should then be the first component in your `PATH` environment, i.e. `export PATH=~/go/bin:$PATH`):
 
 ```shell
-make BIN=~/go/bin install-tools-local
+BIN=~/go/bin make install-tools-local
 ```
 
 Additionally, you have to install at least the following tools via your OS's package manager (this list might not be always up-to-date):