texconfig: add page (#22600)

* Add text config page

* Fixing textconfig format

* Update pages/common/texconfig.md

There other formats than a4, letter, Ex: legal, ledger, tabloid, a3,...

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/common/texconfig.md

Another mistake I should have looked into it

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Fixing {latex} -> {format}

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Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>