[NFC][MLGO] Convert notes to proper RST note directives in MLGO.rst (#146450)

llvm/docs/MLGO.rst

@@ -15,7 +15,9 @@ Currently the following heuristics feature such integration:
 
 This document is an outline of the tooling and APIs facilitating MLGO.
 
-Note that tools for orchestrating ML training are not part of LLVM, as they are
+.. note::
+    
+  The tools for orchestrating ML training are not part of LLVM, as they are
   dependency-heavy - both on the ML infrastructure choice, as well as choices of
   distributed computing. For the training scenario, LLVM only contains facilities
   enabling it, such as corpus extraction, training data extraction, and evaluation
@@ -329,7 +331,9 @@ We currently feature 4 implementations:
   the neural network, together with its weights (essentially, loops performing
   matrix multiplications)
 
-NOTE: we are actively working on replacing this with an EmitC implementation
+.. note::
+    
+  we are actively working on replacing this with an EmitC implementation
   requiring no out of tree build-time dependencies.
 
 - ``InteractiveModelRunner``. This is intended for training scenarios where the
@@ -526,7 +530,9 @@ implementation details.
 Building with ML support
 ========================
 
-**NOTE** For up to date information on custom builds, see the ``ml-*``
+.. note::
+  
+  For up to date information on custom builds, see the ``ml-*``
   `build bots <http://lab.llvm.org>`_. They are set up using 
   `like this <https://github.com/google/ml-compiler-opt/blob/main/buildbot/buildbot_init.sh>`_.
 
@@ -562,7 +568,9 @@ You can also specify a URL for the path, and it is also possible to pre-compile
 the header and object and then just point to the precompiled artifacts. See for
 example ``LLVM_OVERRIDE_MODEL_HEADER_INLINERSIZEMODEL``.
 
-**Note** that we are transitioning away from the AOT compiler shipping with the
+.. note::
+
+  We are transitioning away from the AOT compiler shipping with the
   tensorflow package, and to a EmitC, in-tree solution, so these details will
   change soon.