[DOCS] Mention Ninja build system in install/from_source.rst (#4554)

* [DOCS] Mention Ninja build system in install/from_source.rst

* Address comments

docs/install/from_source.rst

@@ -107,6 +107,14 @@ The configuration of TVM can be modified by `config.cmake`.
       cmake ..
       make -j4
 
+  - You can also use Ninja build system instead of Unix Makefiles. It can be faster to build than using Makefiles.
+
+  .. code:: bash
+
+      cd build
+      cmake .. -G Ninja
+      ninja
+
 If everything goes well, we can go to :ref:`python-package-installation`
 
 Building on Windows