Update docs

scripts/generate/templates/EnumerableMap.js

@@ -17,6 +17,7 @@ import {EnumerableSet} from "./EnumerableSet.sol";
  * - Entries are added, removed, and checked for existence in constant time
  * (O(1)).
  * - Entries are enumerated in O(n). No guarantees are made on the ordering.
+ * - Map can be cleared (all entries removed) in O(n).
  *
  * \`\`\`solidity
  * contract Example {
@@ -91,6 +92,20 @@ function remove(Bytes32ToBytes32Map storage map, bytes32 key) internal returns (
     return map._keys.remove(key);
 }
 
+/**
+ * @dev Removes all the entries from a map. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(Bytes32ToBytes32Map storage map) internal {
+    uint256 len = length(map);
+    for (uint256 i = 0; i < len; ++i) {
+        delete map._values[map._keys.at(i)];
+    }
+    map._keys.clear();
+}
+
 /**
  * @dev Returns true if the key is in the map. O(1).
  */
@@ -188,6 +203,16 @@ function remove(${name} storage map, ${keyType} key) internal returns (bool) {
     return remove(map._inner, ${toBytes32(keyType, 'key')});
 }
 
+/**
+ * @dev Removes all the entries from a map. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the map grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(${name} storage map) internal {
+    clear(map._inner);
+}
+
 /**
  * @dev Returns true if the key is in the map. O(1).
  */