chore: remove unused keys from examples under sway repo reference

[gr00vytvniks]

Description

This PR removes unused keys in sway reference so that warnings do not appear while searching for std after creating a new project with forc init.

Closes #4709

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[CLAassistant]

All committers have signed the CLA.

[gr00vytvniks]

@JoshuaBatty

[kayagokalp]

Hey @gr00vytvniks, thanks for the PR! Looks nice :) Let's remove those lines instead of commenting them. I haven't test this yet, but to test it you can basically add a std dependency to your project with git source pointing to this branch.

After removing those lines I'll test it locally 👌

[kayagokalp]

Tested locally and warnings are gone,

 Compiling library core (/Users/kayagokalp/.forc/git/checkouts/std-7556e1648bbdb2a4/f8573a6e36d7bd036bd7406a17e0af2852fbde5b/sway-lib-core)
 Compiling library std (git+https://github.com/gr00vytvniks/sway?branch=gr00vytvniks/rm-unused-deps#f8573a6e36d7bd036bd7406a17e0af2852fbde5b)
 Compiling contract test_duplicate_warnings (/Users/kayagokalp/fuel/test_projects/test_duplicate_warnings)
  Finished debug in 4.008801375s
  contract test_duplicate_warnings
      Bytecode size: 68 bytes

[project]
authors = ["kayagokalp"]
entry = "main.sw"
license = "Apache-2.0"
name = "test_duplicate_warnings"
implicit-std = false

[dependencies]
std = { git = "https://github.com/gr00vytvniks/sway", branch = "gr00vytvniks/rm-unused-deps" }

[eureka-cpu]

🚢