bug#43503: Patch: Improvements regarding commands like find-file-other-tab.

[ej32u]

Hello.

This is what the patch does:

1. Document existing command `ffap-other-tab'.
2. Create `find-file-read-only-other-tab' and `ffap-read-only-other-tab'.
3. Bind "\C-r" to `find-file-read-only-other-tab', like how "\C-f" is
    bound to `find-file-other-tab'.
4. Document `ffap-read-only-other-tab' in misc.texi.

I don't really know the Texinfo format, so I just copied the mark-up used for 
other items.

Is there anything that should be changed?

Thank you.

0001-Improvements-regarding-like-find-file-other-tab.patch
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