Fix typos reported by codespell

test/functional/feature_block.py

@@ -989,7 +989,7 @@ class FullBlockTest(BitcoinTestFramework):
         assert_equal(get_legacy_sigopcount_block(b73), MAX_BLOCK_SIGOPS + 1)
         self.sync_blocks([b73], success=False, reject_code=16, reject_reason=b'bad-blk-sigops', reconnect=True)
 
-        # b74/75 - if we push an invalid script element, all prevous sigops are counted,
+        # b74/75 - if we push an invalid script element, all previous sigops are counted,
         #          but sigops after the element are not counted.
         #
         #       The invalid script element is that the push_data indicates that