Merge pull request #11694 from ethereum/chriseth-patch-1

Use caret for version pragma

docs/contracts/libraries.rst

@@ -132,7 +132,7 @@ custom types without the overhead of external function calls:
 .. code-block:: solidity
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >=0.8.0 <0.9.0;
+    pragma solidity ^0.8.0;
 
     struct bigint {
         uint[] limbs;