DOC: Document deprecated parameters for resample (pandas-dev#22894)

Not too sure they were deprecated from v0.18.0. Need to point this out in the PR.

Author: jmrr

pandas/core/generic.py

@@ -7377,8 +7377,19 @@ def resample(self, rule, how=None, axis=0, fill_method=None, closed=None,
         ----------
         rule : string
             The offset string or object representing target conversion.
+        how : string
+            Method for down- or re-sampling, default to ‘mean’ for downsampling.
+
+            .. deprecated:: 0.18.0
+               The new syntax is .resample(...).mean(), or .resample(...).apply(<func>)
         axis : int, optional, default 0
-            
+            Which index to use for up- or down-sampling. Must be ``DatetimeIndex``,
+            ``TimedeltaIndex`` or ``PeriodIndex``.
+        fill_method : string, default None
+            Filling method for upsampling.
+
+            .. deprecated:: 0.18.0
+               The new syntax is .resample(...).<func>(), e.g. .resample(...).pad()
         closed : {'right', 'left'}
             Which side of bin interval is closed. The default is 'left'
             for all frequency offsets except for 'M', 'A', 'Q', 'BM',
@@ -7396,6 +7407,10 @@ def resample(self, rule, how=None, axis=0, fill_method=None, closed=None,
             By default the input representation is retained.
         loffset : timedelta
             Adjust the resampled time labels.
+        limit : int, default None
+            Maximum size gap when reindexing with ``fill_method``.
+
+            .. deprecated:: 0.18.0
         base : int, default 0
             For frequencies that evenly subdivide 1 day, the "origin" of the
             aggregated intervals. For example, for '5min' frequency, base could