Fix issues identified by codespell 2.2.1 and update ignored words

and also fix spelling in test/lint/lint-locale-dependence.py not caught by the
spelling linter and fix up a paragraph we are touching here in test/README.md.

src/bitcoind.cpp

@@ -216,7 +216,7 @@ static bool AppInit(NodeContext& node, int argc, char* argv[])
                 if (token) { // Success
                     exit(EXIT_SUCCESS);
                 } else { // fRet = false or token read error (premature exit).
-                    tfm::format(std::cerr, "Error during initializaton - check debug.log for details\n");
+                    tfm::format(std::cerr, "Error during initialization - check debug.log for details\n");
                     exit(EXIT_FAILURE);
                 }
             }