doc secp256r1 (#8899)

* Update docs for things related to secp256r1

* docs: update accounts and pubkey documentation

* update table formatting

* Apply suggestions from code review

Co-authored-by: Alessio Treglia <alessio@tendermint.com>

* Apply suggestions from code review

Awesome grammar fixes and style improvements

Co-authored-by: Barrie Byron <barrie.byron@tendermint.com>

* Apply suggestions from code review

Awesome grammar and style improvements.

Co-authored-by: Barrie Byron <barrie.byron@tendermint.com>
Co-authored-by: Alessio Treglia <alessio@tendermint.com>

* hd wallet docs update

* Apply suggestions from code review

Co-authored-by: Barrie Byron <barrie.byron@tendermint.com>

* Update docs/basics/accounts.md

Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>

* Update docs/architecture/adr-020-protobuf-transaction-encoding.md

I agree, let's use "and"

* update code snippet links

Co-authored-by: Alessio Treglia <alessio@tendermint.com>
Co-authored-by: Barrie Byron <barrie.byron@tendermint.com>
Co-authored-by: Amaury <1293565+amaurym@users.noreply.github.com>

docs/architecture/adr-020-protobuf-transaction-encoding.md

@@ -288,8 +288,8 @@ and `FileDescriptor`s and returns a boolean result.
 ### Public Key Encoding
 
 Public keys in the Cosmos SDK implement the `cryptotypes.PubKey` interface.
-We propose to use `Any` for protobuf encoding as we are doing with other interfaces (e.g. in `BaseAccount` `PubKey` or `SignerInfo` `PublicKey`).
-Following public keys are implemented: secp256k1, ed25519 and multisignature.
+We propose to use `Any` for protobuf encoding as we are doing with other interfaces (for example, in `BaseAccount.PubKey` and `SignerInfo.PublicKey`).
+The following public keys are implemented: secp256k1, secp256r1, ed25519 and legacy-multisignature.
 
 Ex: