add short description for the transaction factories

src/transactionsFactories/delegationTransactionsFactory.ts

@@ -24,6 +24,9 @@ interface IValidatorPublicKey {
     hex(): string;
 }
 
+/**
+ * Use this class to create delegation related transactions like creating a new delegation contract or adding nodes.
+ */
 export class DelegationTransactionsFactory {
     private readonly config: Config;
 

src/transactionsFactories/relayedTransactionsFactory.ts

@@ -13,6 +13,9 @@ interface IConfig {
     gasLimitPerByte: BigNumber.Value;
 }
 
+/**
+ * Use this class to create both RelyedV1 and RelayedV2 transactions.
+ */
 export class RelayedTransactionsFactory {
     private readonly config: IConfig;
 

src/transactionsFactories/smartContractTransactionsFactory.ts

@@ -27,6 +27,9 @@ interface TokenComputer {
     isFungible(token: Token): boolean;
 }
 
+/**
+ * Use this class to create transactions to deploy, call or upgrade a smart contract.
+ */
 export class SmartContractTransactionsFactory {
     private readonly config: Config;
     private readonly abiRegistry?: Abi;

src/transactionsFactories/tokenManagementTransactionsFactory.ts

@@ -29,6 +29,9 @@ interface Config {
 
 type RegisterAndSetAllRolesTokenType = "NFT" | "SFT" | "META" | "FNG";
 
+/**
+ * Use this class to create token management transactions like issuing ESDTs, creating NFTs, setting roles, etc.
+ */
 export class TokenManagementTransactionsFactory {
     private readonly config: Config;
     private readonly trueAsHex: string;

src/transactionsFactories/transferTransactionsFactory.ts

@@ -22,6 +22,9 @@ interface TokenComputer {
     isFungible(token: Token): boolean;
 }
 
+/**
+ * Use this class to create transactions for native token transfers (EGLD) or custom tokens transfers (ESDT/NTF/MetaESDT).
+ */
 export class NextTransferTransactionsFactory {
     private readonly config: IConfig;
     private readonly dataArgsBuilder: TokenTransfersDataBuilder;