Add introduction tag for v5.1 contracts (#5228)

Co-authored-by: Ernesto García <ernestognw@gmail.com>
Signed-off-by: Hadrien Croubois <hadrien.croubois@gmail.com>

contracts/utils/Comparators.sol

@@ -2,6 +2,11 @@
 
 pragma solidity ^0.8.20;
 
+/**
+ * @dev Provides a set of functions to compare values.
+ *
+ * _Available since v5.1._
+ */
 library Comparators {
     function lt(uint256 a, uint256 b) internal pure returns (bool) {
         return a < b;

contracts/utils/Errors.sol

@@ -7,6 +7,8 @@ pragma solidity ^0.8.20;
  *
  * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
  * It is recommended to avoid relying on the error API for critical functionality.
+ *
+ * _Available since v5.1._
  */
 library Errors {
     /**

contracts/utils/Packing.sol

@@ -28,6 +28,8 @@ pragma solidity ^0.8.20;
  *     }
  * }
  * ```
+ *
+ * _Available since v5.1._
  */
 // solhint-disable func-name-mixedcase
 library Packing {

contracts/utils/Panic.sol

@@ -18,6 +18,8 @@ pragma solidity ^0.8.20;
  * ```
  *
  * Follows the list from https://github.com/ethereum/solidity/blob/v0.8.24/libsolutil/ErrorCodes.h[libsolutil].
+ *
+ * _Available since v5.1._
  */
 // slither-disable-next-line unused-state
 library Panic {

contracts/utils/ReentrancyGuardTransient.sol

@@ -8,6 +8,8 @@ import {StorageSlot} from "./StorageSlot.sol";
  * @dev Variant of {ReentrancyGuard} that uses transient storage.
  *
  * NOTE: This variant only works on networks where EIP-1153 is available.
+ *
+ * _Available since v5.1._
  */
 abstract contract ReentrancyGuardTransient {
     using StorageSlot for *;

contracts/utils/SlotDerivation.sol

@@ -34,6 +34,8 @@ pragma solidity ^0.8.20;
  *
  * NOTE: This library provides a way to manipulate storage locations in a non-standard way. Tooling for checking
  * upgrade safety will ignore the slots accessed through this library.
+ *
+ * _Available since v5.1._
  */
 library SlotDerivation {
     /**

contracts/utils/cryptography/Hashes.sol

@@ -4,6 +4,8 @@ pragma solidity ^0.8.20;
 
 /**
  * @dev Library of standard hash functions.
+ *
+ * _Available since v5.1._
  */
 library Hashes {
     /**

contracts/utils/cryptography/P256.sol

@@ -14,6 +14,8 @@ import {Errors} from "../Errors.sol";
  * Based on the original https://github.com/itsobvioustech/aa-passkeys-wallet/blob/d3d423f28a4d8dfcb203c7fa0c47f42592a7378e/src/Secp256r1.sol[implementation of itsobvioustech] (GNU General Public License v3.0).
  * Heavily inspired in https://github.com/maxrobot/elliptic-solidity/blob/c4bb1b6e8ae89534d8db3a6b3a6b52219100520f/contracts/Secp256r1.sol[maxrobot] and
  * https://github.com/tdrerup/elliptic-curve-solidity/blob/59a9c25957d4d190eff53b6610731d81a077a15e/contracts/curves/EllipticCurve.sol[tdrerup] implementations.
+ *
+ * _Available since v5.1._
  */
 library P256 {
     struct JPoint {

contracts/utils/cryptography/RSA.sol

@@ -11,6 +11,8 @@ import {Math} from "../math/Math.sol";
  * RSA semantically secure for signing messages.
  *
  * Inspired by https://github.com/adria0/SolRsaVerify/blob/79c6182cabb9102ea69d4a2e996816091d5f1cd1[Adrià Massanet's work] (GNU General Public License v3.0).
+ *
+ * _Available since v5.1._
  */
 library RSA {
     /**

contracts/utils/structs/CircularBuffer.sol

@@ -34,6 +34,8 @@ import {Panic} from "../Panic.sol";
  *     CircularBuffer.Bytes32CircularBuffer private myBuffer;
  * }
  * ```
+ *
+ * _Available since v5.1._
  */
 library CircularBuffer {
     /**

contracts/utils/structs/Heap.sol

@@ -33,6 +33,8 @@ import {StorageSlot} from "../StorageSlot.sol";
  * IMPORTANT: This library allows for the use of custom comparator functions. Given that manipulating
  * memory can lead to unexpected behavior. Consider verifying that the comparator does not manipulate
  * the Heap's state directly and that it follows the Solidity memory safety rules.
+ *
+ * _Available since v5.1._
  */
 library Heap {
     using Arrays for *;