Fix specs title typo (#2586)

* fix(exec-engine): typo

* specs: fix TOC
Co-authored-by: Ori Pomerantz <qbzzt1@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

specs/exec-engine.md

@@ -4,7 +4,7 @@
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 **Table of Contents**
 
-- [Depositited transaction processing](#depositited-transaction-processing)
+- [Deposited transaction processing](#deposited-transaction-processing)
   - [Deposited transaction boundaries](#deposited-transaction-boundaries)
 - [Engine API](#engine-api)
   - [`engine_forkchoiceUpdatedV1`](#engine_forkchoiceupdatedv1)
@@ -20,7 +20,7 @@
 
 This document outlines the modifications, configuration and usage of a L1 execution engine for L2.
 
-## Depositited transaction processing
+## Deposited transaction processing
 
 The Engine interfaces abstract away transaction types with [EIP-2718][eip-2718].