doc: fix typos

As found by lint-spelling.py using codespell 2.2.6.

src/test/orphanage_tests.cpp

@@ -112,7 +112,7 @@ BOOST_AUTO_TEST_CASE(DoS_mapOrphans)
         }
         SignatureData empty;
         BOOST_CHECK(SignSignature(keystore, *txPrev, tx, 0, SIGHASH_ALL, empty));
-        // Re-use same signature for other inputs
+        // Reuse same signature for other inputs
         // (they don't have to be valid for this test)
         for (unsigned int j = 1; j < tx.vin.size(); j++)
             tx.vin[j].scriptSig = tx.vin[0].scriptSig;