Correct capitalization in help text for Breadcrumbs block

[andreawetzel]

What?

Closes #78174

Captilizes block name in help text under Advanced > Show on home page

Why?

To match the rest of the capitalization in the User Interface

Use of AI Tools

none

[github-actions]

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Co-authored-by: andreawetzel <awetz583@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>

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[t-hamano]

Nice catch!

[ramonjd]

LGTM! I'll go ahead and merge while I'm here. Thanks folks.