Update frontend and near-api-js wallet docs

[PiVortex]

Fixes #2257 and #2225

• Update snippets in frontend docs
• Add additional wallet methods to frontend docs
• Make it clearer that function call access key is optional in wallet selector and near-api-js
• Add prefix to walletconnection in near-api-js

[PiVortex]

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Current status: executed

Reviewer	Score
@race-of-sloths	1

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🥁 Score it!

@bucanero, please score the PR with @race-of-sloths score [1/2/3/5/8/13]. The contributor deserves it.
If no scoring is provided within 24 hours, this PR will be scored as 1 🦥