[docs] [issue10536] Enhancements to gettext docs

Serhiy Storchaka storchaka+cpython@gmail.com added the comment:

Éric, do you mind to create a PR? But please avoid unnecessary formatting changes like adding a second space between sequences. While I prefer such style, these changes doesn't affect the result output and distract attention from significant changes.

---------- nosy: +serhiy.storchaka

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