[ADD] accounting/l10n_co: Add doc on automatic currency Colombia

[masi-odoo]

Add documentation on the automatic currency rate for CO which is an integration with the "Banco de la Republica" service.

Drive with photos: https://drive.google.com/drive/folders/1jdPv6PNF_ekTuNxqw9GXoIJgII9HN-Eh?usp=sharing

[robodoo]

[StraubCreative]

Hi @masi-odoo

Thank you for your contribution.
Ideally for a PR this small we shouldn't see so many technical issues.

Please review the items below for next time:

• Title tags for PRs like this should have the [IMP] tag not [ADD], since it's an improvement to existing documentation. [ADD] is reserved for brand new modules and files.
• Commit messages are ideally 50 characters or less.
• Headings need to have as many characters in the formatting line as in the heading itself.
• Break lines in the RST to ideally not exceed more than 100 characters. You can break apart most RST directives like hyperlinks and menuselection tags across lines, wherever there's a space.

Thanks again and hope this helps!
I will push up all of the fixes and merge momentarily...

[StraubCreative]

100-character line limit: you can break the link markup if there's a space.

Suggested change

	The official exchange rate is provided by the `Banco de la República <https://suameca.banrep.gov.co/estadisticas-economicas/>`_.
	The official exchange rate is provided by the `Banco de la República
	<https://suameca.banrep.gov.co/estadisticas-economicas/>`_.

[StraubCreative]

100-character line limit: similarly, you can break menuselection tags wherever here's a space.

Suggested change

	Go to :menuselection:`Accounting --> Configuration --> Settings --> Currencies: Automatic Currency Rates`
	to set an **Interval** for the exchange rate or select a different **service**.
	Go to :menuselection:`Accounting --> Configuration --> Settings --> Currencies: Automatic Currency
	Rates` to set an **Interval** for the exchange rate or select a different **service**.

[StraubCreative]

Title underline too short

Suggested change

	Multicurrency
	------------
	Multicurrency
	-------------

[StraubCreative]

ci/minimal check is not passing because the branch name is not properly formatted (needs to start with Odoo version prefix e.g. 16.0, 17.0, 18.0, master so runbot can initiate).

Closing this PR and continuing over on #13967 ...