Improving Japanese document for better translations and Fixing typos in document

[mackey0225]

The other day, I was thrilled to see the Japanese version of the document being provided and made public.
However, I noticed a minor issue in the translation that bothered me, so I made some corrections.

Specifically, "joining and merging" had been translated as "結合と結合," which was a repetition of the same word. I made a slight adjustment to address this.

Furthermore, while reviewing the document, I found several typos and made corrections accordingly.

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[mackey0225]

I have read the CLA Document and I hereby sign the CLA

[mackey0225]

recheck

[jamie-lemon]

Thanks - I'm glad you appreciate the Japanese version of the docs!

I appreciate your suggestion for: 結合とマージ - makes sense to me.

If possible could you redo this PR and remove the edits to the source .po files. This is because the .po files are auto-generated from the corresponding .rst files and so those new amends you made to the .rst files which fix the typos will be auto-amend to their corresponding .po files when we run the generate script again. ( I also have some fixes for other rst files and intend to apply an update to address some other things ).

So, TLDR, please remove the .po fixes, we can merge this and then I'll auto-generate the .po files and add the correct msgstr logs against the new msgid items.

Hope this makes sense.

[mackey0225]

Regarding the .po file, I understand.
I made some mistakes during the corrections, such as using the wrong GitHub account for the commit,
so I have recreated the PR #2733 .
I would appreciate it if you could review this.