Fix grammatical inconsistency in index.mdx (#520)

* Fix grammatical inconsistency in index.mdx

* Update pages/benchmarks/index.mdx

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Co-authored-by: guibescos <59208140+guibescos@users.noreply.github.com>

Author: 0xsimka

pages/benchmarks/index.mdx

@@ -1,6 +1,6 @@
 # Benchmarks
 
-Pyth benchmarks allows users to query a historical archive of prices from [Price Feeds](price-feeds).
+Pyth Benchmarks allows users to query a historical archive of prices from [Price Feeds](price-feeds).
 For example, applications can retrieve the price of BTC/USD as of last Friday at 8:00 AM UTC.
 This price can be used for contract settlement or any other application that requires historical price data.
 Benchmarks data is signed and verifiable on-chain with the same trust assumptions as Price Feeds.