Change case of TOC text

[james-nash]

A content review of some Salt website pages flagged the capitalization of the "On this Page" heading above the TOC links. As per our writing style guide (available on the JPM-internal UI Toolkit site), we use sentence case for page titles and headings, so it should read: "On this page" (note the lowercase 'p').

This PR fixes that and also corrects the capitalization on the aria-label on the <ul> too.

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[coveralls]

Pull Request Test Coverage Report for Build 5543727044

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 63.246%

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Totals
Change from base Build 5543247640:	0.0%
Covered Lines:	1305
Relevant Lines:	1801

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💛 - Coveralls

[DavieReid]

Thanks for the fix, this is indeed something we need to change.

just to be clear, mosaic does not adhere to any JPM-internal UI Toolkit site writing style guide at this time.

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Name	Status	Preview	Comments	Updated (UTC)
mosaic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 13, 2023 1:48pm

[james-nash]

Thanks for the quick review & merge!

just to be clear, mosaic does not adhere to any JPM-internal UI Toolkit site writing style guide at this time.

Fair enough. I was thinking longer term, it might be best to make any text like that configurable via a prop (could be useful for sites that want to use a language other than English too), but wanted to keep things simple for now.