Fix minor grammatical error at top of every page. #110
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"High-quality" is the way to use a compound adjective, which is how the phrase is being used in "The repository for high quality TypeScript type definitions".
More information: https://ell.stackexchange.com/questions/133374/high-quality-or-high-quality/
This is an extremely minor error, but since it's in the header, is probably worth correcting.