DOC: Add note about alias deprecations

The PRs pandas-dev#55792 (Y), pandas-dev#52064 (Q), and pandas-dev#55553 (M) deprecated the single letter version of the aliases in favour of the -end version of them. Add a note to the offset table about deprecations.
tacaswell · May 29, 2024 · b4d40a2 · b4d40a2
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diff --git a/doc/source/user_guide/timeseries.rst b/doc/source/user_guide/timeseries.rst
@@ -1273,6 +1273,10 @@ frequencies. We will refer to these aliases as *offset aliases*.
    are deprecated in favour of the aliases ``h``, ``bh``, ``cbh``,
    ``min``, ``s``, ``ms``, ``us``, and ``ns``.
 
+   Aliases ``Y``, ``M``, and ``Q`` are deprecated in favour of the aliases
+   ``YE``, ``ME``, ``QE``.
+
+
 .. note::
 
     When using the offset aliases above, it should be noted that functions