Fix curl command line

The -o option is supposed to get a filename as a parameter, not a
directory.

Fixes #18658

content/guides/building/get-source-git.md

@@ -133,13 +133,13 @@ You may need to replace the <code class="varname">$USER</code> parameter in the
 <h4>Build Tools:</h4>
 
 ```sh
-git clone "ssh://$USER@git.haiku-os.org/buildtools" && curl -Lo "buildtools/.git/hooks/" https://git.haiku-os.org/tools/hooks/commit-msg
+git clone "ssh://$USER@git.haiku-os.org/buildtools" && curl -Lo "buildtools/.git/hooks/commit-msg" https://git.haiku-os.org/tools/hooks/commit-msg
 ```
 
 <h4>Haiku:</h4>
 
 ```sh
-git clone "ssh://$USER@git.haiku-os.org/haiku" && curl -Lo "haiku/.git/hooks/" https://git.haiku-os.org/tools/hooks/commit-msg
+git clone "ssh://$USER@git.haiku-os.org/haiku" && curl -Lo "haiku/.git/hooks/commit-msg" https://git.haiku-os.org/tools/hooks/commit-msg
 ```
 
 <h4>Preparing your first patch</h4>
@@ -149,7 +149,7 @@ Before making a commit, install a Git hook that will automatically
 for you:
 
 ```sh
-curl -Lo "haiku/.git/hooks/" https://git.haiku-os.org/tools/hooks/commit-msg
+curl -Lo "haiku/.git/hooks/commit-msg" https://git.haiku-os.org/tools/hooks/commit-msg
 ```
 
 If a maintainer asks you to correct something later on, Gerrit will use that