consistently use a :class: qualifier for admonitions

doc/src/Developer_code_design.rst

@@ -203,6 +203,7 @@ processed in the expected order before types are removed from dynamic
 dispatch.
 
 .. admonition:: Important Notes
+   :class: note
 
    In order to be able to detect incompatibilities at compile time and
    to avoid unexpected behavior, it is crucial that all member functions

doc/src/Fortran.rst

@@ -956,6 +956,7 @@ Procedures Bound to the :f:type:`lammps` Derived Type
       :f:func:`extract_atom` between runs.
 
    .. admonition:: Array index order
+      :class: tip
 
       Two-dimensional arrays returned from :f:func:`extract_atom` will be
       **transposed** from equivalent arrays in C, and they will be indexed
@@ -1068,6 +1069,7 @@ Procedures Bound to the :f:type:`lammps` Derived Type
    you based on data from the :cpp:class:`Compute` class.
 
    .. admonition:: Array index order
+      :class: tip
 
       Two-dimensional arrays returned from :f:func:`extract_compute` will be
       **transposed** from equivalent arrays in C, and they will be indexed
@@ -1326,6 +1328,7 @@ Procedures Bound to the :f:type:`lammps` Derived Type
    :rtype data: polymorphic
 
    .. admonition:: Array index order
+      :class: tip
 
       Two-dimensional global, per-atom, or local array data from
       :f:func:`extract_fix` will be **transposed** from equivalent arrays in

doc/src/Install_git.rst

@@ -52,6 +52,7 @@ your machine and "release" is one of the 3 branches listed above.
 between them at any time using "git checkout <branch name>".)
 
 .. admonition:: Saving time and disk space when using ``git clone``
+   :class: note
 
    The complete git history of the LAMMPS project is quite large because
    it contains the entire commit history of the project since fall 2006,

doc/src/pair_mliap.rst

@@ -145,6 +145,7 @@ per line.
 The detail of *nn* module implementation can be found at :ref:`(Yanxon) <Yanxon2020>`.
 
 .. admonition:: Notes on mliappy models
+   :class: note
 
    When the *model* keyword is *mliappy*, if the filename ends in '.pt',
    or '.pth', it will be loaded using pytorch; otherwise, it will be