Copy update follow up /contact-us

[mtruj013]

Done

• Follow up of https://github.com/canonical/canonical.com/pull/1178, updated copy as per doc

QA

• View the site locally in your web browser at: https://canonical-com-1179.demos.haus/contact-us
• See that "Correspondence" has been changed to "mailing"

[webteam-app]

Demo starting at https://canonical-com-1179.demos.haus

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8cfde40) 66.55% compared to head (b50db21) 66.55%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1179 +/- ## ======================================= Coverage 66.55% 66.55% ======================================= Files 10 10 Lines 891 891 ======================================= Hits 593 593 Misses 298 298 ``` | [Flag](https://app.codecov.io/gh/canonical/canonical.com/pull/1179/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | Coverage Δ | | |---|---|---| | [python](https://app.codecov.io/gh/canonical/canonical.com/pull/1179/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | `66.55% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical#carryforward-flags-in-the-pull-request-comment) to find out more.

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