[SPARK-44889][PYTHON][CONNECT] Fix docstring of monotonically_increasing_id

### What changes were proposed in this pull request?
Fix docstring of `monotonically_increasing_id`

### Why are the changes needed?
1, using `from pyspark.sql import functions as F` to avoid implicit wildcard import;
2, using dataframe APIs instead of RDD, so the docstring can be reused in Connect;

after this fix, all dostrings are reused between vanilla PySpark and Spark Connect Python Client

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

### How was this patch tested?
CI

### Was this patch authored or co-authored using generative AI tooling?
No

Closes apache#42582 from zhengruifeng/fix_monotonically_increasing_id_docstring.

Authored-by: Ruifeng Zheng <[email protected]>
Signed-off-by: Ruifeng Zheng <[email protected]>

Author: zhengruifeng

python/pyspark/sql/connect/functions.py

@@ -3901,9 +3901,6 @@ def _test() -> None:
 
     globs = pyspark.sql.connect.functions.__dict__.copy()
 
-    # Spark Connect does not support Spark Context but the test depends on that.
-    del pyspark.sql.connect.functions.monotonically_increasing_id.__doc__
-
     globs["spark"] = (
         PySparkSession.builder.appName("sql.connect.functions tests")
         .remote("local[4]")

python/pyspark/sql/functions.py

@@ -4312,9 +4312,22 @@ def monotonically_increasing_id() -> Column:
 
     Examples
     --------
-    >>> df0 = sc.parallelize(range(2), 2).mapPartitions(lambda x: [(1,), (2,), (3,)]).toDF(['col1'])
-    >>> df0.select(monotonically_increasing_id().alias('id')).collect()
-    [Row(id=0), Row(id=1), Row(id=2), Row(id=8589934592), Row(id=8589934593), Row(id=8589934594)]
+    >>> from pyspark.sql import functions as F
+    >>> spark.range(0, 10, 1, 2).select(F.monotonically_increasing_id()).show()
+    +-----------------------------+
+    |monotonically_increasing_id()|
+    +-----------------------------+
+    |                            0|
+    |                            1|
+    |                            2|
+    |                            3|
+    |                            4|
+    |                   8589934592|
+    |                   8589934593|
+    |                   8589934594|
+    |                   8589934595|
+    |                   8589934596|
+    +-----------------------------+
     """
     return _invoke_function("monotonically_increasing_id")