docs(schema): fix leftover Italian "Chiave" in English schema header

[tmchow]

Fixes #313. The English schema reference page at https://yml.publiccode.tools/country.html (sourced from docs/standard/schema.it.rst) had one section header that was still in Italian — Chiave ``riuso/codiceIPA`` (*deprecated*) — while every other sibling header in the same file uses Key. This was the only leftover Italian on line 130.

Changes

• docs/standard/schema.it.rst: Chiave → Key on line 130.
• Adjusted the RST underline by 6 characters so it matches the new heading length (RST requires the underline to be >= the title length).

Verification

Before:

$ grep -cE '^Key |^Chiave ' docs/standard/schema.it.rst
12
$ grep -n '^Chiave ' docs/standard/schema.it.rst
130:Chiave ``riuso/codiceIPA`` (*deprecated*)

After:

$ grep -cE '^Key |^Chiave ' docs/standard/schema.it.rst
12
$ grep -n '^Chiave ' docs/standard/schema.it.rst
(no results)

All 12 Key ... section headers now follow the same pattern. Page renders to country.html at build time, so the fix lands on the published page automatically.

Non-goals

• Only the Chiave → Key case the issue called out. Not touching any of the field names in backticks (like piattafome on line 107, which is inside a key identifier and therefore intentional / out of scope for a language-consistency fix).
• No changes to docs/standard/schema.core.rst or docs/standard/country.rst.

Fixes #313

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[bfabio]

@tmchow patch is good, thanks!

Can you please squash the commit message down to just the title before I merge? The body is a bit much for a one-liner 😄

Save your tokens man.

[tmchow]

@tmchow patch is good, thanks!

Can you please squash the commit message down to just the title before I merge? The body is a bit much for a one-liner 😄

Save your tokens man.

lol. When I'm new to a repo I use some of my skills to just do summary so it's super clear 😀

[tmchow]

Squashed down to the title line (force-pushed to e798a15). Ready when you are, thanks!