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[MINOR][DOCS] Fix the link to the pickle module page in RDD Programming Guide

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### What changes were proposed in this pull request?
This pull request changes the link to the pickle module page from https://docs.python.org/2/library/pickle.html to https://docs.python.org/3/library/pickle.html in RDD Programming Guide.

### Why are the changes needed?
Since Python 2 is no longer supported and it is preferable to refer to the pickle module page of Python 3.

### Does this PR introduce _any_ user-facing change?
Yes.
Before: the `Pickle` link's destination page was https://docs.python.org/2/library/pickle.html
After: the `Pickle` link's destination page is https://docs.python.org/3/library/pickle.html

### How was this patch tested?
By building the documentation site and check the link's destination page is changed correctly in the local environment.

Closes #30081 from kjmrknsn/docs-fix-pickle-link.

Authored-by: Keiji Yoshida <kjmrknsn@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
This commit is contained in:
Keiji Yoshida 2020-10-18 17:13:55 +09:00 committed by HyukjinKwon
parent 7766a6fb5f
commit d2f328aba6
1 changed files with 1 additions and 1 deletions
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docs/rdd-programming-guide.md
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@ -1254,7 +1254,7 @@ storage levels is:
</tr>
</table>
**Note:** *In Python, stored objects will always be serialized with the [Pickle](https://docs.python.org/2/library/pickle.html) library,
**Note:** *In Python, stored objects will always be serialized with the [Pickle](https://docs.python.org/3/library/pickle.html) library,
so it does not matter whether you choose a serialized level. The available storage levels in Python include `MEMORY_ONLY`, `MEMORY_ONLY_2`,
`MEMORY_AND_DISK`, `MEMORY_AND_DISK_2`, `DISK_ONLY`, `DISK_ONLY_2`, and `DISK_ONLY_3`.*