fix(docs): add AssetManager_XRP and AssetManager_FDOGE in reference documentation (#507)

Author: fassko

docs/fassets/8-reference.mdx

@@ -47,9 +47,11 @@ import SolidityReference from "@site/src/components/DataTables/SolidityReference
         |         **Contract** | **Address**                                                                                                                                | **Description**                                                                                                                          |
         | -------------------: | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------- |
         | `AgentOwnerRegistry` | [`0xa7f5d3C81f55f2b072FB62a0D4A03317BFd1a3c0`](https://songbird-explorer.flare.network/address/0xa7f5d3C81f55f2b072FB62a0D4A03317BFd1a3c0) | Manages agent whitelisting and allows setting and retrieving details such as work and management addresses, name, description, and icon. |
+        |   `AssetManager_XRP` | [`0x299d678f67e7ADD4efdf295Ebe0E92FCb4f75C4c`](https://songbird-explorer.flare.network/address/0x299d678f67e7ADD4efdf295Ebe0E92FCb4f75C4c) | Smart ontract that can mint and burn FXRP while managing collateral and backing funds. |
         |               `FXRP` | [`0xF9a84f4ec903F4EaB117A9c1098BeC078BA7027d`](https://songbird-explorer.flare.network/address/0xF9a84f4ec903F4EaB117A9c1098BeC078BA7027d) | The FAsset-wrapped XRP token, ready for use on Songbird.                                                                             |
+        | `AssetManager_FDOGE` | [`0x866077dC52445167dC971643c1b2910608eD0C5A`](https://songbird-explorer.flare.network/address/0x866077dC52445167dC971643c1b2910608eD0C5A) | Smart ontract that can mint and burn FDOGE while managing collateral and backing funds. |
         |              `FDOGE` | [`0xaa25ee3B68c515e69A463876Ab262bc4e8339030`](https://songbird-explorer.flare.network/address/0xaa25ee3B68c515e69A463876Ab262bc4e8339030) | The FAsset-wrapped DOGE token, ready for use on Songbird.                                                                             |
-        |               `USDX` | [`0x4A771Cc1a39FDd8AA08B8EA51F7Fd412e73B3d2B`](https://songbird-explorer.flare.network/address/0x4A771Cc1a39FDd8AA08B8EA51F7Fd412e73B3d2B) | ERC-20 token used by FAssets.                                                                                                            |
+        |               `USDX` | [`0x4A771Cc1a39FDd8AA08B8EA51F7Fd412e73B3d2B`](https://songbird-explorer.flare.network/address/0x4A771Cc1a39FDd8AA08B8EA51F7Fd412e73B3d2B) | ERC-20 token used by FAssets as vault collateral.                                                                                                            |
 
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