[MINOR][DOCS] fix default value of history server
[MINOR][DOCS] fix default value of history server

### What changes were proposed in this pull request?
Alignment between the documentation and the code.

### Why are the changes needed?

The [actual default value ](https://github.com/apache/spark/blame/master/core/src/main/scala/org/apache/spark/internal/config/History.scala#L198) for `spark.history.custom.executor.log.url.applyIncompleteApplication` is `true` and not `false` as stated in the documentation.

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

### How was this patch tested?

Closes #35577 from itayB/doc.

Authored-by: Itay Bittan <41683bba6225ed3faa5d32a5ad12c92ef5ae8a6f@gmail.com>
Signed-off-by: Yuming Wang <a045e9e381e8d6ed98f3af6ea924f96c8dd7fbad@ebay.com>
(cherry picked from commit ae67adde4d2dc0a75e03710fc3e66ea253feeda3)
Signed-off-by: Yuming Wang <a045e9e381e8d6ed98f3af6ea924f96c8dd7fbad@ebay.com>

milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark,milliman/spark