docs: fix typos

[pgrimaud]

Hi,

This tiny PR will fix :

• 1 typo in Example-Background/SwiftSyft-Background/SceneDelegate.swift
• 1 typo in SwiftSyft/Classes/SignallingClient.swift
• 1 typo in SwiftSyft/Classes/SyftWebSocket.swift

Best! 🤖

[codecov]

Codecov Report

Merging #147 into master will decrease coverage by 0.21%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   52.49%   52.28%   -0.22%     
==========================================
  Files          16       16              
  Lines        1861     1861              
==========================================
- Hits          977      973       -4     
- Misses        884      888       +4     

Impacted Files	Coverage Δ
SwiftSyft/Classes/SignallingClient.swift	70.90% <0.00%> (ø)
SwiftSyft/Classes/SyftWebSocket.swift	0.00% <0.00%> (ø)
SwiftSyft/Classes/DownloadService.swift	75.86% <0.00%> (-13.80%)	⬇️

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