Fix possessive apostrophe errors in mqtt/strings.json

[SeifEddineMezned]

Proposed change

This PR fixes missing possessive apostrophes in user-facing strings in homeassistant/components/mqtt/strings.json.

• Fixed "MQTT brokers certificate" -> "MQTT broker's certificate" (appeared twice)
• Fixed "the brokers correct username and password" -> "the broker's correct username and password"

Type of change

• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: none
• This PR is related to issue: none
• Link to documentation pull request: none
• Link to developer documentation pull request: none
• Link to frontend pull request: none

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• I have followed the [perfect PR recommendations][perfect-pr]
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

To help with the load of incoming pull requests:

• I have reviewed two other [open pull requests][prs] in this repository.

[home-assistant]

Hey there @emontnemery, @jbouwh, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (mqtt) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This pull request corrects possessive apostrophes in the MQTT integration’s user-facing English strings (strings.json), improving the grammar shown in the config flow/reauth UI.

Changes:

• Updated two occurrences of “MQTT brokers certificate” to “MQTT broker's certificate”.
• Updated “the brokers correct username and password” to “the broker's correct username and password”.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

Learn more about our pull request process.

[Copilot]

Pull request overview

Updates English user-facing MQTT integration strings to correct possessive apostrophes in certificate/authentication text shown in the config/reauth flows.

Changes:

• Fixes two instances of “MQTT brokers certificate” to “MQTT broker's certificate”.
• Fixes “the brokers correct username and password” to “the broker's correct username and password”.

[jbouwh]

LGTM,
Thanks @SeifEddineMezned 👍

[SeifEddineMezned]

@jbouwh thanks for your support

[jbouwh]

Thanks to you!