docs/buildroot.html: fix typo

docs/buildroot.html

@@ -32,7 +32,7 @@
       <li><a href="#custom_uclibc">Customizing the uClibc
       configuration</a></li>
       <li><a href="#buildroot_innards">How Buildroot works</a></li>
-      <li><a href="#multi_project"Building several projects in the
+      <li><a href="#multi_project">Building several projects in the
       same buildroot source tree</a></li>
       <li><a href="#using_toolchain">Using the uClibc toolchain
       outside Buildroot</a></li>