fix(docs): missing [

Co-authored-by: Kristaps Grinbergs <kristaps@flare.network>

Author: nikerzetic-aflabs

docs/fcc/guides/01-sign.mdx

@@ -95,7 +95,7 @@ contract InstructionSender {
 The constructor takes the addresses of the two Flare system contracts.
 These are already deployed on Coston2 — the deploy tooling reads their addresses from `config/coston2/deployed-addresses.json`.
 This is a temporary solution, because the Flare confidential compute is still in development.
-On release, both addresses will be available through the `FlareContractRegistry`](/network/guides/flare-contracts-registry) contract.
+On release, both addresses will be available through the [`FlareContractRegistry`](/network/guides/flare-contracts-registry) contract.
 :::
 
 ### Instruction Parameters