DOC: Fix some core.resample.Resampler docstrings
Similar to issues #59698, #59592, and #59458.

Fixes: 
```text
-i "pandas.core.resample.Resampler.max PR01,RT03,SA01" \
-i "pandas.core.resample.Resampler.mean SA01" \
-i "pandas.core.resample.Resampler.min PR01,RT03,SA01" \
-i "pandas.core.resample.Resampler.prod SA01" \
-i "pandas.core.resample.Resampler.std SA01" \
-i "pandas.core.resample.Resampler.var SA01" \
```

All docstrings are now only showing ES01 as missing, which according to code_checks.sh line 71, is okay.
pre-commit.ci autofix @knowltod - can you merge main and resolve the conflict Thanks @knowltod 