[SPARK-35250][SQL][DOCS] Fix duplicated STOP_AT_DELIMITER to SKIP_VALUE at CSV's unescapedQuoteHandling option documentation

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

This is rather a followup of #30518 that should be ported back to `branch-3.1` too.
`STOP_AT_DELIMITER` was mistakenly used twice. The duplicated `STOP_AT_DELIMITER` should be `SKIP_VALUE` in the documentation.

### Why are the changes needed?

To correctly document.

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

Yes, it fixes the user-facing documentation.

### How was this patch tested?

I checked them via running linters.

Closes #32423 from HyukjinKwon/SPARK-35250.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
(cherry picked from commit 8aaa9e8)
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

Author: HyukjinKwon

python/pyspark/sql/readwriter.py

@@ -701,7 +701,7 @@ def csv(self, path, schema=None, sep=None, encoding=None, quote=None, escape=Non
             * ``STOP_AT_DELIMITER``: If unescaped quotes are found in the input, consider the value
               as an unquoted value. This will make the parser accumulate all characters until the
               delimiter or a line ending is found in the input.
-            * ``STOP_AT_DELIMITER``: If unescaped quotes are found in the input, the content parsed
+            * ``SKIP_VALUE``: If unescaped quotes are found in the input, the content parsed
               for the given value will be skipped and the value set in nullValue will be produced
               instead.
             * ``RAISE_ERROR``: If unescaped quotes are found in the input, a TextParsingException

python/pyspark/sql/streaming.py

@@ -915,7 +915,7 @@ def csv(self, path, schema=None, sep=None, encoding=None, quote=None, escape=Non
             * ``STOP_AT_DELIMITER``: If unescaped quotes are found in the input, consider the value
               as an unquoted value. This will make the parser accumulate all characters until the
               delimiter or a line ending is found in the input.
-            * ``STOP_AT_DELIMITER``: If unescaped quotes are found in the input, the content parsed
+            * ``SKIP_VALUE``: If unescaped quotes are found in the input, the content parsed
               for the given value will be skipped and the value set in nullValue will be produced
               instead.
             * ``RAISE_ERROR``: If unescaped quotes are found in the input, a TextParsingException

sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala

@@ -743,7 +743,7 @@ class DataFrameReader private[sql](sparkSession: SparkSession) extends Logging {
    *     <li>`STOP_AT_DELIMITER`: If unescaped quotes are found in the input, consider the value
    *     as an unquoted value. This will make the parser accumulate all characters until the
    *     delimiter or a line ending is found in the input.</li>
-   *     <li>`STOP_AT_DELIMITER`: If unescaped quotes are found in the input, the content parsed
+   *     <li>`SKIP_VALUE`: If unescaped quotes are found in the input, the content parsed
    *     for the given value will be skipped and the value set in nullValue will be produced
    *     instead.</li>
    *     <li>`RAISE_ERROR`: If unescaped quotes are found in the input, a TextParsingException

sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamReader.scala

@@ -412,7 +412,7 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    *     <li>`STOP_AT_DELIMITER`: If unescaped quotes are found in the input, consider the value
    *     as an unquoted value. This will make the parser accumulate all characters until the
    *     delimiter or a line ending is found in the input.</li>
-   *     <li>`STOP_AT_DELIMITER`: If unescaped quotes are found in the input, the content parsed
+   *     <li>`SKIP_VALUE`: If unescaped quotes are found in the input, the content parsed
    *     for the given value will be skipped and the value set in nullValue will be produced
    *     instead.</li>
    *     <li>`RAISE_ERROR`: If unescaped quotes are found in the input, a TextParsingException