Update docs

contracts/security/PullPayment.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts (last updated v4.7.0) (security/PullPayment.sol)
+// OpenZeppelin Contracts (last updated v4.8.0) (security/PullPayment.sol)
 
 pragma solidity ^0.8.0;
 
@@ -7,7 +7,7 @@ import "../utils/escrow/Escrow.sol";
 
 /**
  * @dev Simple implementation of a
- * https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment]
+ * https://consensys.github.io/smart-contract-best-practices/development-recommendations/general/external-calls/#favor-pull-over-push-for-external-calls[pull-payment]
  * strategy, where the paying contract doesn't interact directly with the
  * receiver account, which must withdraw its payments itself.
  *

contracts/security/ReentrancyGuard.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
+// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)
 
 pragma solidity ^0.8.0;
 
@@ -48,14 +48,20 @@ abstract contract ReentrancyGuard {
      * `private` function that does the actual work.
      */
     modifier nonReentrant() {
-        // On the first call to nonReentrant, _notEntered will be true
+        _nonReentrantBefore();
+        _;
+        _nonReentrantAfter();
+    }
+
+    function _nonReentrantBefore() private {
+        // On the first call to nonReentrant, _status will be _NOT_ENTERED
         require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
 
         // Any calls to nonReentrant after this point will fail
         _status = _ENTERED;
+    }
 
-        _;
-
+    function _nonReentrantAfter() private {
         // By storing the original value once again, a refund is triggered (see
         // https://eips.ethereum.org/EIPS/eip-2200)
         _status = _NOT_ENTERED;