fix spelling issue (#5490)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

contracts/governance/extensions/GovernorTimelockControl.sol

@@ -17,7 +17,7 @@ import {SafeCast} from "../../utils/math/SafeCast.sol";
  * the assets and permissions must be attached to the {TimelockController}. Any asset sent to the {Governor} will be
  * inaccessible from a proposal, unless executed via {Governor-relay}.
  *
- * WARNING: Setting up the TimelockController to have additional proposers or cancellers besides the governor is very
+ * WARNING: Setting up the TimelockController to have additional proposers or cancelers besides the governor is very
  * risky, as it grants them the ability to: 1) execute operations as the timelock, and thus possibly performing
  * operations or accessing funds that are expected to only be accessible through a vote, and 2) block governance
  * proposals that have been approved by the voters, effectively executing a Denial of Service attack.

contracts/utils/structs/Checkpoints.sol

@@ -114,7 +114,7 @@ library Checkpoints {
     }
 
     /**
-     * @dev Returns the number of checkpoint.
+     * @dev Returns the number of checkpoints.
      */
     function length(Trace224 storage self) internal view returns (uint256) {
         return self._checkpoints.length;
@@ -317,7 +317,7 @@ library Checkpoints {
     }
 
     /**
-     * @dev Returns the number of checkpoint.
+     * @dev Returns the number of checkpoints.
      */
     function length(Trace208 storage self) internal view returns (uint256) {
         return self._checkpoints.length;
@@ -520,7 +520,7 @@ library Checkpoints {
     }
 
     /**
-     * @dev Returns the number of checkpoint.
+     * @dev Returns the number of checkpoints.
      */
     function length(Trace160 storage self) internal view returns (uint256) {
         return self._checkpoints.length;

scripts/generate/templates/Checkpoints.js

@@ -119,7 +119,7 @@ function latestCheckpoint(${opts.historyTypeName} storage self) internal view re
 }
 
 /**
- * @dev Returns the number of checkpoint.
+ * @dev Returns the number of checkpoints.
  */
 function length(${opts.historyTypeName} storage self) internal view returns (uint256) {
     return self.${opts.checkpointFieldName}.length;