updated description of using session keys with Engine

[eabdelmoneim]

---

PR-Codex overview

This PR updates the documentation for account transactions, emphasizing the use of session keys for interacting with smart accounts. It clarifies the roles of the x-backend-wallet-address and x-account-address headers.

Detailed summary

• Updated section title to Transact with an account using session keys.
• Clarified that the x-backend-wallet-address must be from a wallet granted signing permission via a session key.
• Specified that the x-account-address refers to the deployed smart account address.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.80%. Comparing base (90010ee) to head (b8e8462).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6474   +/-   ##
=======================================
  Coverage   54.80%   54.80%           
=======================================
  Files         875      875           
  Lines       54851    54851           
  Branches     3738     3738           
=======================================
  Hits        30062    30062           
  Misses      24695    24695           
  Partials       94       94           

Flag	Coverage Δ
packages	54.80% <ø> (ø)

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size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
thirdweb (esm)	46.94 KB (0%)	939 ms (0%)	130 ms (+267.97% 🔺)	1.1 s
thirdweb (cjs)	127.18 KB (0%)	2.6 s (0%)	170 ms (+130.11% 🔺)	2.8 s
thirdweb (minimal + tree-shaking)	5.6 KB (0%)	113 ms (0%)	101 ms (+3506.45% 🔺)	213 ms
thirdweb/chains (tree-shaking)	506 B (0%)	10 ms (0%)	62 ms (+7527.39% 🔺)	72 ms
thirdweb/react (minimal + tree-shaking)	19.34 KB (0%)	387 ms (0%)	83 ms (+1340.55% 🔺)	470 ms