Update market-hours.mdx

[ndiakom]

Description

• Corrected UK equity timezone (from "GMT" to "UK time")
• Standardised "holiday" capitalisation if referring to trading venues
• Added entry for Reference Rates

Type of Change

• New Page
• Page update/improvement
• Fix typo/grammar
• Restructure/reorganize content
• Update links/references
• Other (please describe):

Areas Affected

https://docs.pyth.network/price-feeds/market-hours

Checklist

• I ran pre-commit run --all-files to check for linting errors
• I have reviewed my changes for clarity and accuracy
• All links are valid and working
• Images (if any) are properly formatted and include alt text
• Code examples (if any) are complete and functional
• Content follows the established style guide
• Changes are properly formatted in Markdown
• Preview renders correctly in development environment

Related Issues

N/A

Closes #

Additional Notes

N/A

Contributor Information

• Name: Nicholas Diakomihalis
• Email: nicholas@dourolabs.xyz

Screenshots

N/A

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Name	Status	Preview	Updated (UTC)
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