[SPARK-41649][CONNECT] Deduplicate docstrings in pyspark.sql.connect.window

### What changes were proposed in this pull request?

This PR proposes to deduplicate docstrings in `pyspark.sql.connect.window`.

### Why are the changes needed?

For easier maintenance

### Does this PR introduce _any_ user-facing change?

No, dev-only. There're mintor doc changes that mention about remote support in Apache Spark 3.4.

### How was this patch tested?

No test. It has to be manually verified until we resolve SPARK-41653.

Closes #39180 from HyukjinKwon/SPARK-41649.

Authored-by: Hyukjin Kwon <gurwls223@apache.org>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>