Apply suggestion to docs/installation_instructions.rst

docs/installation_instructions.rst

@@ -73,9 +73,10 @@ and checkout the latest tagged version (currently ``0.3.1``):
     $ git clone -b 0.3.1 https://open.greenhost.net/openappstack/openappstack.git
     $ cd openappstack
 
-    **NOTE:** Git will display a warning after you use the ``git``
-    command saying that you are in a *detached HEAD* state. This is
-    perfectly normal and you can proceed without any further actions.
+.. note::
+  Git will display a warning after you use the ``git`` command saying that you
+  are in a *detached HEAD* state. This is perfectly normal and you can proceed
+  without any further actions.
 
 Create a python virtual environment called "env" that uses python 3.
 This makes sure we do not change any of your other python projects. The