[SPARK-40327][PS][DOCS] Add resampling to API references

[zhengruifeng]

What changes were proposed in this pull request?

Add resampling to API references

Why are the changes needed?

Docs for resampling is missing

Does this PR introduce any user-facing change?

yes, new docs

How was this patch tested?

existing UT

[zhengruifeng]

Warning, treated as error:
/__w/spark/spark/python/docs/source/reference/pyspark.pandas/resampling.rst:2:Explicit markup ends without a blank line; unexpected unindent.
make: *** [Makefile:35: html] Error 2
                    ------------------------------------------------
      Jekyll 4.2.1   Please append `--trace` to the `build` command 
                     for any additional information or backtrace. 
                    ------------------------------------------------

@itholic @HyukjinKwon @Yikun Do you have any ideas? It keep failing like this, even though I tried several changs

[itholic]

Warning, treated as error:
/__w/spark/spark/python/docs/source/reference/pyspark.pandas/resampling.rst:2:Explicit markup ends without a blank line; unexpected unindent.
make: *** [Makefile:35: html] Error 2
                    ------------------------------------------------
      Jekyll 4.2.1   Please append `--trace` to the `build` command 
                     for any additional information or backtrace. 
                    ------------------------------------------------

@itholic @HyukjinKwon @Yikun Do you have any ideas? It keep failing like this, even though I tried several changs

Seems like the lines should be aligned as below:

 ..  Licensed to the Apache Software Foundation (ASF) under one
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 ..    http://www.apache.org/licenses/LICENSE-2.0

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+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.

[zhengruifeng]

Merged into master, thank you guys!