DOC: correct examples for Resample a time series for clarity (#58947)

update documentation for resample a time series to another frequency

Author: natmokval

doc/source/getting_started/intro_tutorials/09_timeseries.rst

@@ -295,7 +295,7 @@ Aggregate the current hourly time series values to the monthly maximum value in
 
 .. ipython:: python
 
-    monthly_max = no_2.resample("ME").max()
+    monthly_max = no_2.resample("MS").max()
     monthly_max
 
 A very powerful method on time series data with a datetime index, is the

doc/source/user_guide/timeseries.rst

@@ -1864,15 +1864,15 @@ to resample based on datetimelike column in the frame, it can passed to the
        ),
    )
    df
-   df.resample("ME", on="date")[["a"]].sum()
+   df.resample("MS", on="date")[["a"]].sum()
 
 Similarly, if you instead want to resample by a datetimelike
 level of ``MultiIndex``, its name or location can be passed to the
 ``level`` keyword.
 
 .. ipython:: python
 
-   df.resample("ME", level="d")[["a"]].sum()
+   df.resample("MS", level="d")[["a"]].sum()
 
 .. _timeseries.iterating-label: