Update BUILDING.md

Author: avivkeller

BUILDING.md

@@ -691,7 +691,7 @@ disk space.
   git clone https://github.com/nodejs/node.git
   cd node
   ```
-> [!TIP]
+> \[!TIP]
 > If you are building from a Windows machine, symlinks are disabled by default, and can be enabled by cloning
 > with the `-c core.symlinks=true` flag.
 > ```powershell