Update EIP-5564: update contract name

Merged by EIP-Bot.

EIPS/eip-5564.md

@@ -97,11 +97,11 @@ A one byte integer (`schemeId`) is used to identify stealth address schemes. The
 
 - The algorithm for the `computeStealthKey` method.
 
-This specification additionally defines a singleton `ERC5564Messenger` contract that emits events to announce when something is sent to a stealth address. This MUST be a singleton contract, with one instance per chain. The contract is specified as follows:
+This specification additionally defines a singleton `ERC5564Announcer` contract that emits events to announce when something is sent to a stealth address. This MUST be a singleton contract, with one instance per chain. The contract is specified as follows:
 
 ```solidity
 /// @notice Interface for announcing when something is sent to a stealth address.
-contract IERC5564Messenger {
+contract IERC5564Announcer {
   /// @dev Emitted when sending something to a stealth address.
   /// @dev See the `announce` method for documentation on the parameters.
   event Announcement (
@@ -165,7 +165,7 @@ Stealth meta-addresses may be managed by the user and/or registered within a pub
 
 ### Initial Implementation of SECP256k1 with View Tags
 
-This EIP provides a foundation that is not tied to any specific cryptographic system through the `IERC5564Messenger` contract. In addition, it introduces the first implementation of a [stealth address scheme](../assets/eip-5564/scheme_ids.md) that utilizes the SECP256k1 elliptic curve and view tags. The SECP256k1 elliptic curve is defined with the equation $y^2 = x^3 + 7 \pmod{p}$, where $p = 2^{256} - 2^{32} - 977$.
+This EIP provides a foundation that is not tied to any specific cryptographic system through the `IERC5564Announcer` contract. In addition, it introduces the first implementation of a [stealth address scheme](../assets/eip-5564/scheme_ids.md) that utilizes the SECP256k1 elliptic curve and view tags. The SECP256k1 elliptic curve is defined with the equation $y^2 = x^3 + 7 \pmod{p}$, where $p = 2^{256} - 2^{32} - 977$.
 
 The following reference is divided into three sections: