Update EIP-5564: update contract name and scheme id

Merged by EIP-Bot.

EIPS/eip-5564.md

@@ -85,7 +85,7 @@ function computeStealthKey(
 
 The implementation of these methods is scheme-specific. The specification of a new stealth address scheme MUST specify the implementation for each of these methods. Additionally, although these function interfaces are specified in Solidity, they do not necessarily ever need to be implemented in Solidity, but any library or SDK conforming to this specification MUST implement these methods with compatible function interfaces.
 
-A one byte integer (`schemeId`) is used to identify stealth address schemes. The `schemeId` represents an incrementing integer beginning at 0. A mapping from the `schemeId` to its specification MUST be declared in the EIP that proposes to standardize a new stealth address scheme. Furthermore, the schemeId MUST be added to [this overview](../assets/eip-5564/scheme_ids.md). These EIP extensions MUST specify:
+A 256 bit integer (`schemeId`) is used to identify stealth address schemes. A mapping from the schemeId to its specification MUST be declared in the EIP that proposes to standardize a new stealth address scheme. It is RECOMMENDED  that `schemeId`s are chosen to be monotonically incrementing integers for simplicity, but arbitrary or meaningful `schemeId`s  may be chosen. Furthermore, the schemeId MUST be added to [this overview](../assets/eip-5564/scheme_ids.md). These extensions MUST specify:
 
 - The integer identifier for the scheme.
 
@@ -113,7 +113,7 @@ contract IERC5564Announcer {
   );
 
   /// @dev Called by integrators to emit an `Announcement` event.
-  /// @param schemeId The applied stealth address scheme (f.e. secp25k1).
+  /// @param schemeId The integer specifying the applied stealth address scheme.
   /// @param stealthAddress The computed stealth address for the recipient.
   /// @param ephemeralPubKey Ephemeral public key used by the sender.
   /// @param metadata An arbitrary field MUST include the view tag in the first byte.
@@ -280,3 +280,4 @@ Thus, the sender may attach a small amount of ETH to each stealth address transa
 ## Copyright
 
 Copyright and related rights waived via [CC0](../LICENSE.md).
+