Update overview.adoc

Author: LandauRaz

modules/guides/pages/becoming-a-validator/overview.adoc

@@ -1,6 +1,6 @@
 = Becoming a Starknet validator guide overview
 
-Welcome to the official guide for becoming Starknet validator! ✅
+Welcome to the official guide for becoming a Starknet validator! ✅
 
 While Starknet is currently still centralized, it is gradually moving towards employing a staking protocol, handing over the responsibilities of producing, attesting, and proving blocks to validators.
 
@@ -18,4 +18,4 @@ Ready? Let's go! 🏁
 Although this guide assumes no prior knowledge, it is highly recommended to go over xref:architecture:staking.adoc[the specifications of Starknet's staking protocol] before following it.
 
 For any questions or inquiries, reach out to us on https://t.me/+CLZl_F_Nj2RlNjU0[Telegram^].
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