Remove "extension only" caveats for Solana and Multichain (#2122)

Author: alexandratran

wallet/concepts/multichain-api.md

@@ -5,7 +5,7 @@ description: Learn about the Multichain API.
 # About the Multichain API
 
 :::tip Experimental
-The Multichain API is an experimental feature and currently only available on the extension (not on mobile).
+The Multichain API is an experimental feature.
 :::
 
 The Multichain API is a scalable, generalized web3 wallet API that supports simultaneous

wallet/how-to/manage-networks/use-multichain.md

@@ -6,7 +6,7 @@ toc_max_heading_level: 4
 # Interact with multiple networks simultaneously
 
 :::tip Experimental
-The Multichain API is an experimental feature and currently only available on the extension (not on mobile).
+The Multichain API is an experimental feature.
 :::
 
 You can use the Multichain API to interact with multiple blockchain networks in MetaMask simultaneously.

wallet/how-to/use-non-evm-networks/solana.md

@@ -13,11 +13,6 @@ Solana Devnet is only supported on [MetaMask Flask](/snaps/get-started/install-f
 After adding Solana to MetaMask Flask, [show test networks](https://support.metamask.io/configure/networks/how-to-view-testnets-in-metamask/) to view Solana Devnet.
 :::
 
-:::info Extension only
-Connecting your dapp to Solana in MetaMask is currently only available on the extension.
-Mobile support is coming soon.
-:::
-
 ## Wallet Standard
 
 MetaMask implements the [Wallet Standard](https://github.com/wallet-standard/wallet-standard), so MetaMask is supported out-of-the-box for Solana dapps that use the Wallet Standard or that integrate Solana's [Wallet Adapter](https://github.com/anza-xyz/wallet-adapter/blob/master/APP.md).

wallet/reference/multichain-api.md

@@ -8,7 +8,7 @@ import TabItem from "@theme/TabItem";
 # Multichain API
 
 :::tip Experimental
-The Multichain API is an experimental feature and currently only available on the extension (not on mobile).
+The Multichain API is an experimental feature.
 :::
 
 Dapps can call Multichain API [methods](#methods) to create and manage