Fix PR reviews remarks: enhance code doc

Author: Alenar

mithril-common/src/entities/single_signatures.rs

@@ -23,7 +23,7 @@ pub struct SingleSignatures {
 
     /// Message that is signed by the signer
     ///
-    /// Used to buffer the signature for later if the Aggregator has yet to create an open message
+    /// Used to buffer the signature for later if the aggregator has yet to create an open message
     /// for the signed entity type.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub signed_message: Option<String>,

mithril-common/src/messages/register_signature.rs

@@ -24,7 +24,7 @@ pub struct RegisterSignatureMessage {
 
     /// Message that is signed by the signer
     ///
-    /// Used to buffer the signature for later if the Aggregator has yet to create an open message
+    /// Used to buffer the signature for later if the aggregator has yet to create an open message
     /// for the signed entity type.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub signed_message: Option<String>,

openapi.yaml

@@ -1072,8 +1072,8 @@ components:
           description: |
             Hash of the protocol message that is signed by the signer
 
-            Optional, allow the aggregator to store this signature for later if it has yet to start to work
-            on the message.
+            Optional, allows the aggregator to store this signature for later if it has yet to start aggregating
+            signatures for the message.
           type: string
           format: bytes
       example: