Update AppKit documentation to reflect latest changes

[devin-ai-integration]

Update AppKit documentation to reflect latest changes

Changes

• Updated documentation for "UX by reown" branding footer to clarify that it's always displayed, regardless of termsConditionsUrl and privacyPolicyUrl settings
• Updated Android and Unity documentation for getAccount method to include the namespace parameter
• Added examples for namespace parameter usage in different blockchain networks (EVM, Solana, Bitcoin)

Related Changes

These documentation updates reflect changes made in the following AppKit PRs:

• PR #4324: Fixes wui-ux-by-reown to make it always displayed
• PR #3969: Added appKit.getAccount public method with namespace parameter

Link to Devin run: https://app.devin.ai/sessions/5e33506e5e274d05af08056666cb0786
Requested by: Ben Kremer ([email protected])

[devin-ai-integration]

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