docs: fix typos, grammar issues and standardise Wi-Fi spelling

[sefinek]

Changes to markdown files only, no code changes.

README.md

• Remove double punctuation ., in description
• principals → principles
• prob → probably
• WiFi → Wi-Fi

CONTRIBUTING.md

• PLease → Please
• Add missing > prefix to [!NOTE] block so it renders as a callout on GitHub

docs/faq.md

• specific the first byte → specify the first byte
• in anyway → in any way
• **A: ** → **A:**
• change to CR to → change CR to
• air ware → airwaves
• Meshcore → MeshCore
• firmware up need → firmware you need
• IOS or Andriod → iOS or Android
• WiFi / WIFI → Wi-Fi, with TOC anchor updated accordingly
• wifi hotspot → Wi-Fi hotspot

docs/cli_commands.md

• 1.12.+ → 1.12+
• prob → probably

docs/companion_protocol.md

• avoid display → avoid displaying

docs/payloads.md

• ackowledgement → acknowledgement
• Neighors → Neighbors

docs/number_allocations.md

• protcol → protocol

This PR also fixes tables that were not written correctly and improves their formatting.


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[LitBomb]

Thanks for the PR! I reviewed readme and FAQ. These two are good to go.