Use alert syntax for warnings

Github supports alert extensions which are rendered much nicer.

Examples:

> [!NOTE]
> Highlights information that users should take into account, even when skimming.

> [!TIP]
> Optional information to help a user be more successful.

> [!IMPORTANT]
> Crucial information necessary for users to succeed.

> [!WARNING]
> Critical content demanding immediate user attention due to potential risks.

> [!CAUTION]
> Negative potential consequences of an action.

[1] https://github.com/orgs/community/discussions/16925

Signed-off-by: Nir Soffer <[email protected]>

Author: nirs

README.md

@@ -61,8 +61,7 @@ mkdir -p ${HOMEBREW_PREFIX}/var/run
 sudo ${HOMEBREW_PREFIX}/opt/socket_vmnet/bin/socket_vmnet --vmnet-gateway=192.168.105.1 ${HOMEBREW_PREFIX}/var/run/socket_vmnet
 ```
 
-> **Warning**
->
+> [!WARNING]
 > Typically, the `socket_vmnet` binary in the `${HOMEBREW_PREFIX}` can be replaced by any user in the `admin` group.
 
 <details>