Update payment request formats page to include silent payments and bip-353 human readable addresses

[yashrajd]

Update payment request formats page to include silent payments and bip-353 human readable addresses etc.

[yashrajd]

This also addresses Conor's point about BIP-353 being featured on that page.

[GBKS]

Is this completed with #1173?

[yashrajd]

Is this completed with #1173?

This issue only updated the Contacts page, this issue would update the payments request formats page.